Air conditioning unit

Abstract

According to the air conditioning unit, a function selection coefficient and the total current of an outdoor unit are obtained, and a first threshold value = the total current of the outdoor unit * the function selection coefficient is calculated; obtaining a second threshold value corresponding to the current limit value; the first threshold value and the second threshold value are compared, and the larger value is used as a power limiting threshold value cardinal number Kud; determining a first power limiting threshold value E according to the power limiting threshold value cardinal number Kud; and the real-time current of the compressor is obtained, and when the real-time current of the compressor reaches the first electricity limiting threshold value E, the frequency of the compressor is reduced. Therefore, according to the air conditioning unit, the function selection coefficient, the total current of the outdoor unit and the current limit value are comprehensively considered to accurately determine the power limiting threshold cardinal number Kud, then the first power limiting threshold E is determined, when the real-time current of the compressor reaches the first power limiting threshold E, the frequency of the compressor is reduced to save energy and power, and the purposes of power limiting and power saving are achieved; the technical problem that power-saving control is not carried out in the prior art 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 save energy and electricity is an important criterion for measuring the performance of the air-conditioning unit.

[0004] In the existing air-conditioning unit control mode, there is no corresponding logical control for the mandatory power-rationing policy. This situation may lead to penalties in some areas for failure to use air-conditioning as required.

[0005] Most manufacturers in the industry currently can only rely on external equipment to save power on air-conditioning units, which cannot guarantee the best use of the air conditioner. Summary of the invention

[0006] The present invention provides an air conditioning unit, which solves the technical problem that there is no power saving control 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 controller is configured to: obtain a function selection coefficient and a total current of an outdoor unit, and calculate a first threshold value = total current of the outdoor unit * function selection coefficient; obtain a second threshold value corresponding to a current limit value; compare the first threshold value with the second threshold value, and use the larger value as a power limit threshold base; determine a first power limit threshold value according to the power limit threshold base; obtain a real-time current of a compressor, and when the real-time current of the compressor reaches the first power limit threshold value, reduce the frequency of the compressor.

[0010] In some embodiments of the present application, determining the first power-limit threshold according to the power-limit threshold base specifically includes:

[0011] The first power-limiting threshold = m1 × power-limiting threshold base + m2;

[0012] Wherein, m1 is a constant greater than 1, and m2 is a constant greater than 0.

[0013] In some embodiments of the present application, the controller is further configured to:

[0014] When the real-time current of the compressor rises to the fourth power-limiting threshold, the compressor frequency is prohibited from rising;

[0015] Wherein, the fourth power-limiting threshold value=power-limiting threshold base value-a11;

[0016] a11 is a constant greater than 0; the fourth power-limiting threshold value is less than the first power-limiting threshold value.

[0017] In some embodiments of the present application, the controller is further configured to:

[0018] When the real-time current of the compressor drops to the third power-limiting threshold, the compressor frequency is prohibited from increasing;

[0019] When the real-time current of the compressor drops to the fifth power-limiting threshold, the compressor frequency resumes free adjustment;

[0020] Wherein, the third power-limiting threshold value=power-limiting threshold base value-a10;

[0021] The fifth power-limiting threshold value = the power-limiting threshold base value - a12;

[0022] a10 and a12 are both constants greater than 0; the fifth power-limiting threshold value is less than the third power-limiting threshold value and less than the first power-limiting threshold value.

[0023] In some embodiments of the present application, the controller is further configured to:

[0024] When the real-time current of the compressor rises to the second power-limiting threshold, the compressor frequency decreases at a first speed;

[0025] When the real-time current of the compressor rises to the first power-limiting threshold, the compressor frequency decreases at a second speed; the second speed is greater than the first speed;

[0026] Wherein, the second power-limiting threshold value=power-limiting threshold base value-a9;

[0027] a9 is a constant greater than 0; the second power-limiting threshold is less than the first power-limiting threshold.

[0028] In some embodiments of the present application, the controller is further configured to:

[0029] A correspondence between a preset operation mode, a current limit value, and a second threshold value;

[0030] A corresponding second threshold is obtained according to the current operation mode and the current current limit value.

[0031] In some embodiments of the present application, the controller is further configured to:

[0032] When the function selection coefficient ∈ (0, 1), the total current of the outdoor unit is obtained and the first threshold is calculated;

[0033] When the function selection coefficient is 0, the current threshold base corresponding to the current limit value is obtained; the first current threshold is equal to the current threshold base, and when the real-time current of the compressor reaches the first current threshold, the frequency of the compressor is reduced.

[0034] In some embodiments of the present application, the controller is further configured to:

[0035] When the real-time current of the compressor rises to the fourth current threshold, the compressor frequency is prohibited from rising; the fourth current threshold = the current threshold base - a7;

[0036] Wherein, a7 is a constant greater than 0; and the fourth current threshold is less than the first current threshold.

[0037] In some embodiments of the present application, the controller is further configured to:

[0038] When the real-time current of the compressor drops to the third current threshold, the compressor frequency is prohibited from increasing;

[0039] When the real-time current of the compressor drops to the fifth current threshold, the frequency of the compressor resumes free adjustment;

[0040] Wherein, the third current threshold=current threshold base-a6;

[0041] The fifth current threshold=current threshold base-a8;

[0042] a6 and a8 are both constants greater than 0; the fifth current threshold value is less than the third current threshold value and less than the first current threshold value.

[0043] In some embodiments of the present application, the controller is further configured to:

[0044] The correspondence between the preset operation mode, the current limit value and the current threshold base number;

[0045] According to the current operation mode and the current current limit value, the corresponding current threshold base is obtained.

[0046] The technical solution of the present invention has the following technical effects compared with the prior art: the air-conditioning unit of the present invention obtains the function selection coefficient and the total current of the outdoor unit, and calculates the first threshold value = the total current of the outdoor unit * the function selection coefficient; obtains the second threshold value corresponding to the current limit value; compares the first threshold value with the second threshold value, and takes the larger value as the power limit threshold base Kud; determines the first power limit threshold E according to the power limit threshold base Kud; obtains the real-time current of the compressor, and when the real-time current of the compressor reaches the first power limit threshold E, reduces the frequency of the compressor. Therefore, the air-conditioning unit of the present invention comprehensively considers the function selection coefficient, the total current of the outdoor unit, and the current limit value to accurately determine the power limit threshold base Kud, and then determines the first power limit threshold E. When the real-time current of the compressor reaches the first power limit threshold E, reduces the frequency of the compressor to save energy and electricity, and achieves the purpose of power limit and power saving, solving the technical problem that there is no power saving control in the prior art.

[0047] 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

[0048] 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.

[0049] Figure 1 A flowchart of an embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0050] Figure 2 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0051] Figure 3 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0052] Figure 4 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0053] Figure 5 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0054] Figure 6 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0055] Figure 7 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0056] Figure 8 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0057] Fig. 9 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0058] Fig.10 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0059] Fig.11 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0060] Fig.12 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0061] Fig.13 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0062] Fig.14 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0063] Fig.15 This is a timing diagram of compressor frequency control of the air conditioning unit of the present invention. DETAILED DESCRIPTION

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] The air conditioning unit of this embodiment includes an outdoor unit, an indoor unit, a controller, etc.

[0076] The outdoor unit includes a compressor, an outdoor heat exchanger, an outdoor fan, etc.

[0077] The indoor unit includes an indoor heat exchanger, an indoor fan, etc.

[0078] Controller, which controls the operation of the entire air conditioning unit.

[0079] The controller is configured to: obtain a function selection coefficient and a total current of an outdoor unit, and calculate a first threshold value = total current of the outdoor unit * function selection coefficient; obtain a second threshold value corresponding to a current limit value; compare the first threshold value with the second threshold value, and use the larger value as a power limit threshold base Kud; determine a first power limit threshold value E according to the power limit threshold base Kud; obtain a real-time current of the compressor, and when the real-time current of the compressor reaches the first power limit threshold value E, reduce the frequency of the compressor.

[0080] Therefore, in some embodiments of the present application, the controller performs the following steps, see Figure 1 described.

[0081] Step S11: Obtaining the function selection coefficient.

[0082] According to the power restriction requirements of different regions, the function selection is carried out, and different function selection coefficients are selected to represent different power restriction levels. Function selection coefficient ∈ [0, 1).

[0083] The function selection coefficient is represented by DRM. The air conditioner unit (such as the outdoor unit) is provided with a function selection terminal block for function selection, thereby determining the size of DRM.

[0084] For example, the function selection terminal block has 3 terminals. When terminal 1 is connected to terminal 2, DRM = x; when terminal 1 is connected to terminal 3, DRM = y; when terminal 1 is neither connected to terminal 2 nor to terminal 3, DRM = 0.

[0085] When DRM=0, the air conditioner unit is in normal power-limiting mode;

[0086] When DRM=x, the air conditioning unit is in the first power-limiting mode;

[0087] When DRM=y, the air conditioning unit is in the second power-limiting mode.

[0088] Among them, 0<x<y<1.

[0089] Step S12: Obtain the total current of the outdoor unit.

[0090] Step S13: Calculate the first threshold Kud1 = total current of the outdoor unit * function selection coefficient.

[0091] The total current of the outdoor unit is represented by I, and the function selection coefficient is represented by DRM.

[0092] Kud1 = I × DRM.

[0093] Step S14: obtaining a second threshold Kudf corresponding to the current limit value.

[0094] The current limit value is a percentage, and the installer sets the current limit value during installation and commissioning. Different current limit values ​​correspond to different second threshold values ​​Kudf.

[0095] Step S15: compare the first threshold Kud1 with the second threshold Kudf, and use the larger value as the power-limiting threshold base Kud.

[0096] When Kud1>Kudf, Kud=Kud1;

[0097] When Kud1<Kudf, Kud=Kudf;

[0098] When Kud1=Kudf, Kud=Kud1 or Kudf.

[0099] Step S16: determining a first power-limit threshold E according to the power-limit threshold base Kud.

[0100] Step S17: Obtain the real-time current of the compressor.

[0101] Step S18: Determine whether the real-time current of the compressor reaches the first power-limiting threshold E.

[0102] When the real-time current of the compressor reaches the first power-limiting threshold value E, step S19 is executed: reducing the frequency of the compressor.

[0103] The function selection coefficient * the total current of the outdoor unit is taken as the first threshold, and compared with the second threshold corresponding to the current limit value, the larger value is taken as the power limit threshold base Kud, and the first power limit threshold E is determined according to the power limit threshold base Kud; when the real-time current of the compressor reaches the first power limit threshold E, it means that the real-time current of the compressor is large, and the frequency of the compressor needs to be reduced to achieve the purpose of energy saving and power saving.

[0104] The air conditioning unit of this embodiment obtains the function selection coefficient and the total current of the outdoor unit, calculates the first threshold value = the total current of the outdoor unit * the function selection coefficient; obtains the second threshold value corresponding to the current limit value; compares the first threshold value with the second threshold value, and takes the larger value as the power limit threshold base Kud; determines the first power limit threshold E according to the power limit threshold base Kud; obtains the real-time current of the compressor, and when the real-time current of the compressor reaches the first power limit threshold E, reduces the frequency of the compressor. Therefore, the air conditioning unit of this embodiment comprehensively considers the function selection coefficient, the total current of the outdoor unit, and the current limit value to accurately determine the power limit threshold base Kud, and then determines the first power limit threshold E. When the real-time current of the compressor reaches the first power limit threshold E, reduces the frequency of the compressor to save energy and electricity, and achieves the purpose of power limit and power saving, solving the technical problem that there is no power saving control in the prior art.

[0105] In some embodiments of the present application, determining the first power limit threshold E according to the power limit threshold base Kud specifically includes:

[0106] The first power-limiting threshold E=m1×power-limiting threshold base Kud+m2;

[0107] Wherein, m1 is a constant greater than 1, and m2 is a constant greater than 0.

[0108] For example, m1=2, m2=1. E=2×Kud+1.

[0109] There is a linear relationship between the first power-limit threshold E and the power-limit threshold base Kud, and the value of the first power-limit threshold E can be accurately determined according to the power-limit threshold base Kud.

[0110] In some embodiments of the present application, the controller is further configured to perform the following steps: Figure 2 shown.

[0111] Step S21: Determine whether the real-time current of the compressor rises to the fourth power-limiting threshold B.

[0112] When the real-time current of the compressor rises to the fourth power-limiting threshold value B, step S22 is executed: the compressor frequency is prohibited from rising.

[0113] Wherein, the fourth power-limiting threshold B=power-limiting threshold base Kud-a11;

[0114] a11 is a constant greater than 0; the fourth power-limiting threshold B is less than the first power-limiting threshold E.

[0115] When the real-time current of the compressor rises to the fourth power-limiting threshold value B, the compressor frequency is prohibited from rising, so as to save energy and electricity and achieve the purpose of power limiting and saving electricity.

[0116] In some embodiments of the present application, the controller is further configured to perform the following steps: Figure 3 shown.

[0117] Step S31: Determine whether the real-time current of the compressor drops to the third power-limiting threshold C.

[0118] When the real-time current of the compressor drops to the third power-limiting threshold C, it means that although the real-time current of the compressor has dropped, it is still large, and step S32 is executed: the compressor frequency is prohibited from rising to save energy and electricity, thereby achieving the purpose of power limiting and saving electricity.

[0119] In some embodiments of the present application, the controller is further configured to perform the following steps: Figure 4 shown.

[0120] Step S41: Determine whether the real-time current of the compressor drops to the fifth power-limiting threshold A.

[0121] When the real-time current of the compressor drops to the fifth power-limiting threshold value A, it indicates that the real-time current of the compressor is relatively small, and step S42 is executed: the frequency of the compressor resumes free adjustment.

[0122] The third power-limit threshold C=power-limit threshold base Kud-a10.

[0123] The fifth power-limiting threshold value A=the power-limiting threshold base number Kud-a12.

[0124] a10 and a12 are both constants greater than 0; the fifth power-limiting threshold A<the third power-limiting threshold C<the first power-limiting threshold E.

[0125] In some embodiments of the present application, the controller is further configured to perform the following steps: Figure 5 shown.

[0126] Step S51: Determine whether the real-time current of the compressor rises to the second power-limiting threshold D.

[0127] When the real-time current of the compressor rises to the second power-limiting threshold D, it indicates that the real-time current of the compressor is very large, and step S52 is executed: the compressor frequency is reduced at a first speed to save energy and electricity, thereby achieving the purpose of power limiting and saving.

[0128] In some embodiments of the present application, the controller is further configured to perform the following steps: Figure 6 shown.

[0129] Step S61: Determine whether the real-time current of the compressor rises to the first power-limiting threshold E.

[0130] When the real-time current of the compressor rises to the first power-limiting threshold E, it indicates that the real-time current of the compressor is very large, and step S62 is executed: the compressor frequency is reduced at a second speed to save energy and electricity, thereby achieving the purpose of power limiting and saving electricity. The second speed is greater than the first speed.

[0131] Wherein, the second power-limiting threshold D=power-limiting threshold base Kud-a9;

[0132] a9 is a constant greater than 0; the second power-limiting threshold D is less than the first power-limiting threshold E.

[0133] Therefore, the air conditioning unit of this embodiment controls the frequency of the compressor according to the real-time current of the compressor, see Fig.15 The controller is configured as follows:

[0134] When the real-time current of the compressor rises to the fourth power-limiting threshold B, the compressor frequency is prohibited from rising.

[0135] When the real-time current of the compressor rises to the second power-limiting threshold D, the compressor frequency decreases at the first speed; the speed reduction is small.

[0136] When the real-time current of the compressor rises to the first power-limiting threshold value E, the compressor frequency decreases at a second speed; the speed reduction is large; and the second speed is greater than the first speed.

[0137] When the real-time current of the compressor drops to the third power-limiting threshold C, the compressor frequency is prohibited from increasing.

[0138] When the real-time current of the compressor drops to the fifth power-limiting threshold value A, the frequency of the compressor resumes free adjustment, that is, the frequency of the compressor is controlled normally.

[0139] The second power-limiting threshold D=power-limiting threshold base Kud-a9;

[0140] The third power-limiting threshold C=power-limiting threshold base Kud-a10;

[0141] The fourth power-limiting threshold B=power-limiting threshold base Kud-a11;

[0142] The fifth power-limiting threshold value A=power-limiting threshold base value Kud-a12;

[0143] Among them, a9, a10, a11, and a12 are all constants; the fifth power-limit threshold A<the fourth power-limit threshold B<the third power-limit threshold C<the second power-limit threshold D<the first power-limit threshold E, as shown in Table 1.

[0144] Table 1

[0145]

[0146]

[0147] In some embodiments of the present application, the controller is further configured to perform the following steps: Figure 7 shown.

[0148] Step S71: preset a correspondence relationship between operation mode, current limit value and second threshold value.

[0149] Step S72: Obtain a corresponding second threshold value according to the current operation mode and the current current limit value.

[0150] For example, the correspondence table of preset operation mode-current limit value-second threshold value is shown in Table 2 and Table 3. By querying Table 2 or Table 3, the second threshold value Kudf corresponding to the current operation mode and the current current limit value can be obtained.

[0151] Table 2

[0152]

[0153] Table 3

[0154]

[0155] By presetting the correspondence between the operation mode-current limit value-second threshold value, and then querying the correspondence, the second threshold value Kudf corresponding to the current operation mode and the current current limit value can be directly obtained, which is simple, convenient and accurate.

[0156] In some embodiments of the present application, the controller is further configured to:

[0157] When the function selection coefficient ∈ (0, 1), the total current of the outdoor unit is obtained and the first threshold is calculated;

[0158] When the function selection coefficient is 0, the current threshold base Ku corresponding to the current limit value is obtained; the first current threshold is equal to the current threshold base Ku, and when the real-time current of the compressor reaches the first current threshold, the frequency of the compressor is reduced.

[0159] That is, after step S11 and before step S12, the controller is configured to perform the following steps, see Figure 8 shown.

[0160] Step S11 - 1 : Determine whether the function selection coefficient is 0.

[0161] When the function selection coefficient ∈ (0, 1), step S12 is executed: obtaining the total current of the outdoor unit, and then calculating the first threshold.

[0162] When the function selection coefficient is 0, step S81 is executed: obtaining the current threshold base Ku corresponding to the current limit value. The first current threshold is equal to the current threshold base Ku.

[0163] Step S82: Determine whether the real-time current of the compressor reaches the first current threshold.

[0164] When the real-time current of the compressor reaches the first current threshold, step S83 is executed: reducing the frequency of the compressor.

[0165] When the function selection coefficient is 0, the current threshold base Ku corresponding to the current limit value is directly obtained. It is simple, convenient and direct. When the real-time current of the compressor reaches the first current threshold, the frequency of the compressor is reduced to save energy and electricity, thereby achieving the purpose of power limitation and power saving.

[0166] In some embodiments of the present application, the controller is further configured to perform the following steps: Fig. 9 shown.

[0167] Step S91: Determine whether the real-time current of the compressor rises to a fourth current threshold.

[0168] When the real-time current of the compressor rises to the fourth current threshold, step S92 is executed: the compressor frequency is prohibited from rising.

[0169] The fourth current threshold value=current threshold base Ku-a7;

[0170] Wherein, a7 is a constant greater than 0; and the fourth current threshold is less than the first current threshold.

[0171] When the real-time current of the compressor rises to the fourth current threshold, the compressor frequency is prohibited from rising, so as to save energy and electricity and achieve the purpose of power limitation and power saving.

[0172] In some embodiments of the present application, the controller is further configured to perform the following steps: Fig.10 shown.

[0173] Step S101: determine whether the real-time current of the compressor drops to a third current threshold.

[0174] When the real-time current of the compressor drops to the third current threshold, it means that although the real-time current of the compressor drops, it is still large, and step S102 is executed: the compressor frequency is prohibited from rising to save energy and electricity, thereby achieving the purpose of power limiting and power saving.

[0175] In some embodiments of the present application, the controller is further configured to perform the following steps: Fig.11 shown.

[0176] Step S111: determine whether the real-time current of the compressor drops to the fifth current threshold.

[0177] When the real-time current of the compressor drops to the fifth current threshold, it indicates that the real-time current of the compressor is relatively small, and step S112 is executed: the frequency of the compressor resumes free adjustment.

[0178] Wherein, the third current threshold=current threshold base Ku-a6.

[0179] The fifth current threshold value=current threshold base Ku-a8.

[0180] a6 and a8 are both constants greater than 0; the fifth current threshold value is less than the third current threshold value and less than the first current threshold value.

[0181] In some embodiments of the present application, the controller is further configured to perform the following steps: Fig.12 shown.

[0182] Step S121: Determine whether the real-time current of the compressor rises to a second current threshold.

[0183] When the real-time current of the compressor rises to the second current threshold, it indicates that the real-time current of the compressor is very large, and step S122 is executed: the frequency of the compressor is reduced at a first speed to save energy and electricity, thereby achieving the purpose of power limiting and power saving.

[0184] In some embodiments of the present application, the controller is further configured to perform the following steps: Fig.13 shown.

[0185] Step S131: Determine whether the real-time current of the compressor rises to a first current threshold.

[0186] When the real-time current of the compressor rises to the first current threshold, it means that the real-time current of the compressor is very large, and step S132 is executed: the compressor frequency is reduced at a second speed to save energy and electricity, thereby achieving the purpose of power limitation and power saving. The second speed is greater than the first speed.

[0187] Wherein, the second current threshold value = current threshold base Ku-a5;

[0188] a5 is a constant greater than 0; the second current threshold value is less than the first current threshold value.

[0189] In some embodiments of the present application, the controller is further configured to perform the following steps: Fig.14 shown.

[0190] Step S141: preset the corresponding relationship between the operation mode, the current limit value and the current threshold base.

[0191] Step S142: Obtain a corresponding current threshold base value according to the current operation mode and the current current limit value.

[0192] For example, the corresponding table of preset operation mode-current limit value-current threshold cardinality is shown in Table 4 and Table 5. By querying Table 4 or Table 5, the current threshold cardinality Ku corresponding to the current operation mode and the current current limit value can be obtained.

[0193] Table 4

[0194]

[0195]

[0196] Table 5

[0197]

[0198] By presetting the correspondence between the operation mode-current limit value-current threshold cardinality, and then querying the correspondence, the current threshold cardinality Ku corresponding to the current operation mode and the current current limit value can be directly obtained, which is simple, convenient and accurate.

[0199] Therefore, the air conditioning unit of this embodiment controls the frequency of the compressor according to the real-time current of the compressor.

[0200] When the real-time current of the compressor increases to the fourth current threshold, the compressor frequency is prohibited from increasing.

[0201] When the real-time current of the compressor rises to the second current threshold, the compressor frequency decreases at the first speed; the speed reduction is small.

[0202] When the real-time current of the compressor rises to the first current threshold, the compressor frequency decreases at a second speed; the speed decrease is large; the second speed is greater than the first speed.

[0203] When the real-time current of the compressor drops to the third current threshold, the compressor frequency is prohibited from increasing.

[0204] When the real-time current of the compressor drops to the fifth current threshold, the frequency of the compressor resumes free adjustment, that is, the frequency of the compressor is normally controlled.

[0205] The fifth current threshold value<the fourth current threshold value<the third current threshold value<the second current threshold value<the first current threshold value.

[0206] When the power supply voltage is 380V / 415V,

[0207] The second current threshold = current threshold base Ku-a5;

[0208] The third current threshold = current threshold base Ku-a6;

[0209] The fourth current threshold value=current threshold base Ku-a7;

[0210] The fifth current threshold value=current threshold base Ku-a8;

[0211] Among them, a5, a6, a7, and a8 are all constants greater than 0.

[0212] When the power supply voltage is 200V / 220V,

[0213] The second current threshold = current threshold base Ku-a1;

[0214] The third current threshold = current threshold base Ku-a2;

[0215] The fourth current threshold value=current threshold base Ku-a3;

[0216] The fifth current threshold value=current threshold base Ku-a4;

[0217] Among them, a1, a2, a3, and a4 are all constants greater than 0.

[0218] The air conditioning unit of this embodiment is based on the air conditioning current limiting control in response to the mandatory power consumption restriction policy in some foreign regions. The corresponding power saving control can be activated through function selection. Through multi-table data correction, the best use effect of the unit can be achieved when the current is limited.

[0219] 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.

[0220] 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: The controller is configured to: obtain a function selection coefficient and a total current of the outdoor unit, and calculate a first threshold value = the total current of the outdoor unit * the function selection coefficient; Obtaining a second threshold value corresponding to the current limit value; comparing the first threshold value with the second threshold value, and taking the larger value as the power limit threshold base; Determine a first power-limiting threshold value according to the power-limiting threshold base; obtain the real-time current of the compressor, and when the real-time current of the compressor reaches the first power-limiting threshold value, reduce the frequency of the compressor.

2. The air conditioning unit according to claim 1, characterized in that: The determining the first power-limit threshold according to the power-limit threshold base specifically includes: The first power-limiting threshold = m1 × power-limiting threshold base + m2; Wherein, m1 is a constant greater than 1, and m2 is a constant greater than 0.

3. The air conditioning unit according to claim 1, characterized in that: The controller is also configured to: When the real-time current of the compressor rises to the fourth power-limiting threshold, the compressor frequency is prohibited from rising; Wherein, the fourth power-limiting threshold value=power-limiting threshold base value-a11; a11 is a constant greater than 0; the fourth power-limiting threshold value is less than the first power-limiting threshold value.

4. The air conditioning unit according to claim 1, characterized in that: The controller is also configured to: When the real-time current of the compressor drops to the third power-limiting threshold, the compressor frequency is prohibited from increasing; When the real-time current of the compressor drops to the fifth power-limiting threshold, the compressor frequency resumes free adjustment; Wherein, the third power-limiting threshold value=power-limiting threshold base value-a10; The fifth power-limiting threshold value = the power-limiting threshold base value - a12; a10 and a12 are both constants greater than 0; the fifth power-limiting threshold < the third power-limiting threshold < the first power-limiting threshold.

5. The air conditioning unit according to claim 1, characterized in that: The controller is also configured to: When the real-time current of the compressor rises to the second power-limiting threshold, the compressor frequency decreases at a first speed; When the real-time current of the compressor rises to the first power-limiting threshold, the compressor frequency decreases at a second speed; The second speed is greater than the first speed; Wherein, the second power-limiting threshold value=power-limiting threshold base value-a9; a9 is a constant greater than 0; The second power-limiting threshold is less than the first power-limiting threshold.

6. The air conditioning unit according to claim 1, characterized in that: The controller is also configured to: A correspondence between a preset operation mode, a current limit value, and a second threshold value; A corresponding second threshold is obtained according to the current operation mode and the current current limit value.

7. The air conditioning unit according to claim 1, characterized in that: The controller is also configured to: When the function selection coefficient ∈ (0, 1), the total current of the outdoor unit is obtained and the first threshold is calculated; When the function selection coefficient is 0, the current threshold base corresponding to the current limit value is obtained; The first current threshold is equal to the current threshold base, and when the real-time current of the compressor reaches the first current threshold, the frequency of the compressor is reduced.

8. The air conditioning unit according to claim 7, characterized in that: The controller is also configured to: When the real-time current of the compressor rises to the fourth current threshold, the compressor frequency is prohibited from rising; The fourth current threshold value=current threshold base value-a7; Wherein, a7 is a constant greater than 0; the fourth current threshold value is less than the first current threshold value.

9. The air conditioning unit according to claim 7, characterized in that: The controller is also configured to: When the real-time current of the compressor drops to the third current threshold, the compressor frequency is prohibited from increasing; When the real-time current of the compressor drops to the fifth current threshold, the frequency of the compressor resumes free adjustment; Wherein, the third current threshold=current threshold base-a6; The fifth current threshold=current threshold base-a8; a6 and a8 are both constants greater than 0; the fifth current threshold < the third current threshold < the first current threshold.

10. The air conditioning unit according to claim 7, characterized in that: The controller is also configured to: The correspondence between the preset operation mode, the current limit value and the current threshold base number; According to the current operation mode and the current current limit value, the corresponding current threshold base is obtained.

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