A control method and device for air conditioning system, air conditioning system and storage medium

Abstract

The present invention discloses a control method, device, air conditioning system and storage medium for an air conditioning system. The method includes: determining the current external fan speed range of the internal and external fans of the air conditioning system corresponding to the current pressure load of the air conditioning system, recorded as the current external fan speed range of the air conditioning system; determining n levels of speed within the current external fan speed range of the air conditioning system, and obtaining n speeds; controlling the internal and external fans of the air conditioning system to operate at each of the n speeds; determining the power of the air conditioning system at the speed according to the DC bus voltage and the DC bus voltage at each speed, and obtaining n powers of the air conditioning system at n speeds, and determining the speed corresponding to the minimum power as the current speed of the external fan. This scheme can reduce the energy consumption of the air conditioning system by defining the speed range of the external fan according to the pressure load of the air conditioning system, so that the external fan of the air conditioning system operates at the wind speed level with the lowest energy consumption.

Description

Technical Field

[0001] The present invention belongs to the technical field of air-conditioning systems, and specifically relates to a control method, device, air-conditioning system and storage medium of an air-conditioning system, and in particular to a speed control method, device, air-conditioning system and storage medium of an indoor and outdoor fan in an air-conditioning system. Background Art

[0002] In the air conditioning system, the speed of the external fan directly affects the air volume of the heat exchanger and plays a key role in the overall stable operation of the air conditioning system. In related solutions, the speed control of the external fan is mostly operated at the set maximum speed after startup or divided into different wind speeds, so that the external fan can only run at a preset fixed speed or switch between adjacent wind speeds, which cannot effectively avoid energy waste.

[0003] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The object of the present invention is to provide a control method, device, air-conditioning system and storage medium for an air-conditioning system, so as to solve the problem that in related schemes, the speed control of the inner and outer fans of the air-conditioning system is mostly carried out at a set maximum speed after startup or divided into different wind gears, so that the outer fan can only run according to a preset fixed speed or switch between adjacent wind gears, resulting in energy waste of the outer fan. The speed range of the outer fan is defined according to the pressure load of the air-conditioning system, so that the outer fan of the air-conditioning system runs at the wind speed level with the lowest energy consumption, thereby reducing the energy consumption of the air-conditioning system.

[0005] The present invention provides a control method for an air-conditioning system, comprising: obtaining a current pressure load of a compressor in the air-conditioning system when the air-conditioning system is turned on and running, and recording it as the current pressure load of the air-conditioning system; determining a current external fan speed range of an external fan in the air-conditioning system corresponding to the current pressure load of the air-conditioning system, and recording it as the current external fan speed range of the air-conditioning system; determining n levels of speed within the current external fan speed range of the air-conditioning system, and obtaining n speeds, where n is a positive integer and n≥1; controlling the external fans in the air-conditioning system to run at each of the n speeds; and when the external fans in the air-conditioning system run at each of the n speeds , obtain the DC bus voltage of the DC bus power supply of the air-conditioning system and the DC bus current of the DC bus power supply of the air-conditioning system, and record them as the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at the speed; determine the power of the air-conditioning system at any speed among the n speeds according to the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at the speed, thereby obtaining n powers of the air-conditioning system at the n speeds; determine a level of speed corresponding to the minimum power among the n powers of the air-conditioning system at the n speeds as the current speed of the indoor and outdoor fans of the air-conditioning system, and control the indoor and outdoor fans of the air-conditioning system to operate at the current speed.

[0006] In some embodiments, obtaining the current pressure load of the compressor in the air-conditioning system, recorded as the current pressure load of the air-conditioning system, includes: obtaining the pressure load of the compressor in the air-conditioning system at a set sampling time interval, and determining the average value of the pressure load of the compressor in the air-conditioning system sampled within the set sampling period as the current pressure load of the compressor in the air-conditioning system, recorded as the current pressure load of the air-conditioning system; and / or determining n levels of speed within the current external fan speed range of the air-conditioning system to obtain n speeds, including: evenly dividing the current external fan speed range of the air-conditioning system into n levels of speed within the external fan speed range of the air-conditioning system to obtain n speeds.

[0007] In some embodiments, determining the current external fan speed range of the internal and external fan of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, recorded as the current external fan speed range of the air-conditioning system, includes: according to the preset correspondence between the pressure load of the air-conditioning system and the external fan speed range of the air-conditioning system, determining the external fan speed range of the air-conditioning system corresponding to the pressure load of the air-conditioning system that is the same as the current pressure load of the air-conditioning system in the correspondence as the external fan speed range of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, recorded as the current external fan speed range of the air-conditioning system; wherein, presetting the correspondence between the pressure load of the air-conditioning system and the external fan speed range of the air-conditioning system includes: dividing the pressure load of the air-conditioning system into N load levels, N is a positive integer, and N≥1; each load level in the N load levels corresponds to an external fan speed range of the air-conditioning system; wherein, when the current pressure load of the air-conditioning system is greater than or equal to the maximum load level among the N load levels, determining the current speed of the external fan of the air-conditioning system to be the set maximum speed of the external fan.

[0008] In some embodiments, the power of the air-conditioning system at any one of the n speeds is determined based on the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at that speed, including: determining the instantaneous power of the air-conditioning system at that speed based on the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system obtained at a set sampling time interval at any one of the n speeds; and determining the average value of the instantaneous power of the air-conditioning system obtained within a set sampling period at that speed as the power of the air-conditioning system at that speed.

[0009] In some embodiments, it also includes: determining whether the operating conditions of the air-conditioning system have changed; if it is determined that the operating conditions of the air-conditioning system have changed, re-acquiring the current pressure load of the compressor in the air-conditioning system, recorded as the re-acquired current pressure load of the air-conditioning system; re-determining the current speed of the indoor and outdoor fans in the air-conditioning system based on the re-acquired current pressure load of the air-conditioning system, and controlling the indoor and outdoor fans in the air-conditioning system to operate at the current speed.

[0010] In order to match the above method, the present invention provides a control device for an air-conditioning system on the other hand, including: an acquisition unit, configured to acquire the current pressure load of the compressor in the air-conditioning system when the air-conditioning system is running after being turned on, recorded as the current pressure load of the air-conditioning system; a control unit, configured to determine the current external fan speed range of the internal and external fans in the air-conditioning system corresponding to the current pressure load of the air-conditioning system, recorded as the current external fan speed range of the air-conditioning system; the control unit is further configured to determine n levels of speed within the current external fan speed range of the air-conditioning system to obtain n speeds, where n is a positive integer and n≥1; the control unit is further configured to control the internal and external fans in the air-conditioning system to operate at each of the n speeds; the acquisition unit is further configured to control the internal and external fans in the air-conditioning system to operate at each of the n speeds. When the fan is running at each of the n speeds, the DC bus voltage of the DC bus power supply of the air-conditioning system and the DC bus current of the DC bus power supply of the air-conditioning system are obtained, and recorded as the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at the speed; the control unit is also configured to determine the power of the air-conditioning system at any speed among the n speeds according to the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at the speed, thereby obtaining n powers of the air-conditioning system at the n speeds; the control unit is also configured to determine a level of speed corresponding to the minimum power among the n powers of the air-conditioning system at the n speeds as the current speed of the internal and external fans of the air-conditioning system, and control the internal and external fans of the air-conditioning system to run at the current speed.

[0011] In some embodiments, wherein the acquisition unit acquires the current pressure load of the compressor in the air-conditioning system, recorded as the current pressure load of the air-conditioning system, including: acquiring the pressure load of the compressor in the air-conditioning system at a set sampling time interval, and determining the average value of the pressure load of the compressor in the air-conditioning system sampled within the set sampling period as the current pressure load of the compressor in the air-conditioning system, recorded as the current pressure load of the air-conditioning system; and / or, the control unit determines n levels of speed within the current external fan speed range of the air-conditioning system to obtain n speeds, including: evenly dividing the current external fan speed range of the air-conditioning system into n levels of speed within the external fan speed range of the air-conditioning system to obtain n speeds.

[0012] In some embodiments, the control unit determines the current external fan speed range of the internal and external fan of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, recorded as the current external fan speed range of the air-conditioning system, including: according to the preset correspondence between the pressure load of the air-conditioning system and the external fan speed range of the air-conditioning system, the external fan speed range of the air-conditioning system corresponding to the pressure load of the air-conditioning system that is the same as the current pressure load of the air-conditioning system in the correspondence is determined as the external fan speed range of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, recorded as the current external fan speed range of the air-conditioning system; wherein, the control unit pre-sets the correspondence between the pressure load of the air-conditioning system and the external fan speed range of the air-conditioning system, including: dividing the pressure load of the air-conditioning system into N load levels, N is a positive integer, and N≥1; each load level in the N load levels corresponds to an external fan speed range of the air-conditioning system; wherein, the control unit is further configured to determine that the current speed of the external fan of the air-conditioning system is the set external fan maximum speed when the current pressure load of the air-conditioning system is greater than or equal to the maximum load level among the N load levels.

[0013] In some embodiments, the control unit determines the power of the air-conditioning system at any one of the n speeds based on the DC bus voltage and the DC bus current of the air-conditioning system at that speed, including: determining the instantaneous power of the air-conditioning system at that speed based on the DC bus voltage and the DC bus current of the air-conditioning system obtained at a set sampling time interval at any one of the n speeds; and determining the average value of the instantaneous power of the air-conditioning system obtained within a set sampling period at that speed as the power of the air-conditioning system at that speed.

[0014] In some embodiments, it also includes: the control unit is further configured to determine whether the operating conditions of the air-conditioning system have changed; the acquisition unit is further configured to re-acquire the current pressure load of the compressor in the air-conditioning system when it is determined that the operating conditions of the air-conditioning system have changed, and record it as the re-acquired current pressure load of the air-conditioning system; the control unit is further configured to re-determine the current speed of the indoor and outdoor fans in the air-conditioning system based on the re-acquired current pressure load of the air-conditioning system, and control the indoor and outdoor fans in the air-conditioning system to operate at the current speed.

[0015] Matching the above device, the present invention provides an air-conditioning system on another aspect, including: the control device of the air-conditioning system described above.

[0016] In accordance with the above method, the present invention provides a storage medium on another aspect, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned air-conditioning system control method.

[0017] Therefore, the scheme of the present invention divides the pressure load of the air-conditioning system into N load levels in advance, so that each load level corresponds to an external fan speed range; for each external fan speed range, divides the speed into n levels; when the air-conditioning system is turned on and running, the current pressure load of the air-conditioning system, the bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system are detected at a set sampling time interval, and the instantaneous power P of the air-conditioning can be calculated according to the detected bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system; according to the detected current pressure load of the air-conditioning system, the corresponding load level of the current pressure load of the air-conditioning system in the N load levels is determined, and the n levels of speed corresponding to the external fan speed periphery corresponding to the corresponding load level are determined; based on the detected bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system, the n average powers of the air-conditioning system at the n speeds corresponding to the external fan speed periphery corresponding to the corresponding load level are calculated (such as the power of the air-conditioning system ), from the n average powers of the air conditioning system (such as the power of the air conditioning system ), and determine a speed corresponding to the minimum power value from the n speeds corresponding to the outer periphery of the external fan speed corresponding to the corresponding load level, as the current speed of the external fan of the air-conditioning system, and control the external fan of the air-conditioning system to operate at the current speed of the external fan. Thus, by defining the speed range of the external fan according to the pressure load of the air-conditioning system, the external fan of the air-conditioning system operates at the wind speed level with the lowest energy consumption, thereby reducing the energy consumption of the air-conditioning system.

[0018] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention.

[0019] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic flow chart of an embodiment of a method for controlling an air conditioning system of the present invention;

[0021] Figure 2 A schematic diagram of a flow chart of an embodiment of determining the power of the air-conditioning system at each speed in the method of the present invention;

[0022] Figure 3A flow chart of an embodiment of the method of the present invention for re-determining the current rotation speed of the internal and external fans of the air-conditioning system;

[0023] Figure 4 A schematic structural diagram of an embodiment of a control device for an air conditioning system of the present invention;

[0024] Figure 5 It is a structural schematic diagram of an embodiment of a speed control device for an indoor and outdoor fan in an air-conditioning system;

[0025] Figure 6 The present invention is a flow chart of an embodiment of a method for controlling the rotation speed of an indoor and outdoor fan in an air-conditioning system.

[0026] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0027] 102 - acquisition unit; 104 - control unit. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Considering that, in the related schemes, the speed control of the inner and outer fans of the air-conditioning system is mostly operated at a set maximum speed after startup or divided into different wind shields, so that the outer fan can only operate according to a preset fixed speed or switch between adjacent wind shields. When the speed of the outer fan cannot match the load demand of the air-conditioning system and is lower than the load demand of the air-conditioning system, there is a problem of energy waste of the outer fan. For example: the mismatch between the fan and the load will cause problems in the heat dissipation of the air-conditioning system, either the poor heat dissipation effect leads to poor cooling effect, or the air-conditioning system will increase the operating power of the compressor, or the wind speed of the outer fan is too high to cause energy waste, etc. Therefore, the scheme of the present invention proposes a control method for an air-conditioning system, specifically a speed control method for the inner and outer fans of an air-conditioning system, so as to define the speed range of the outer fan according to the pressure load of the air-conditioning system, so that the outer fan of the air-conditioning system runs at the wind speed level with the lowest energy consumption, which can reduce the energy consumption of the air-conditioning system and achieve the purpose of energy saving.

[0030] According to an embodiment of the present invention, a control method for an air conditioning system is provided. Figure 1The flow chart of an embodiment of the method of the present invention is shown. The air conditioning system has a compressor, an external fan and a DC bus power supply. The control method of the air conditioning system includes: steps S110 to S170.

[0031] In step S110 , when the air-conditioning system is started and running, the current pressure load of the compressor in the air-conditioning system is obtained and recorded as the current pressure load of the air-conditioning system.

[0032] In some implementations, obtaining the current pressure load of the compressor in the air-conditioning system in step S110, recorded as the current pressure load of the air-conditioning system, includes: obtaining the pressure load of the compressor in the air-conditioning system at a set sampling time interval, determining the average value of the pressure load of the compressor in the air-conditioning system sampled within the set sampling period as the current pressure load of the compressor in the air-conditioning system, recorded as the current pressure load of the air-conditioning system. Wherein, the sampling time interval is set such as time Ts, the sampling period is set such as time T, and the average value of the pressure loads of several compressors in the air-conditioning system sampled at the set sampling period such as time T at the set sampling time interval such as time Ts is determined as the current pressure load of the compressor in the air-conditioning system.

[0033] Specifically, Figure 5 FIG. 1 is a schematic diagram of a structure of an embodiment of a speed control device for an indoor and outdoor fan in an air conditioning system. Figure 5 As shown, the speed control device of the inner and outer fans of the air-conditioning system, that is, the speed control structure of the outer fan of the air-conditioning system for realizing the speed control method of the inner and outer fans of the air-conditioning system, mainly includes: a pressure detection module and an outer fan speed control module. The pressure detection module is connected to the air-conditioning system and the outer fan speed control module respectively. Among them, the pressure detection module is used to detect the pressure load S (i.e., the suction pressure of the compressor) of the compressor inside the air-conditioning system, which is used to help control the speed of the outer fan.

[0034] In step S120, a current external fan speed range of the internal and external fans of the air-conditioning system corresponding to the current pressure load of the air-conditioning system is determined, which is recorded as the current external fan speed range of the air-conditioning system.

[0035] In some embodiments, step S120 determines the current external fan speed range of the internal and external fan of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, which is recorded as the current external fan speed range of the air-conditioning system, including: according to a preset correspondence between the pressure load of the air-conditioning system and the external fan speed range of the air-conditioning system, determining the external fan speed range of the air-conditioning system corresponding to the pressure load of the air-conditioning system that is the same as the current pressure load of the air-conditioning system in the correspondence as the external fan speed range of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, recorded as the current external fan speed range of the air-conditioning system.

[0036] Wherein, presetting the correspondence between the pressure load of the air-conditioning system and the speed range of the external fan of the air-conditioning system includes: dividing the pressure load of the air-conditioning system into N load levels, where N is a positive integer and N≥1. Each load level of the N load levels corresponds to a speed range of the external fan of the air-conditioning system.

[0037] See also Figure 5 In the example shown, the external fan speed control module adjusts the external fan speed according to the condition of the air-conditioning system. First, the pressure load S of the air-conditioning system is divided into N levels, N≥1, that is, there are pressure load levels S1, S2, S3...SN. Under different pressure load levels, the external fan has a corresponding level of speed range W1, W2, W3...WN, where WN is the maximum speed of the external fan, that is, the pressure load (0, S1] range corresponds to the external fan speed range (0, W1], the pressure load (S1, S2] range corresponds to the external fan speed range (W1, W2], and the pressure load SN is above the maximum fan speed WN. Then the corresponding speed range of a level is divided into levels, that is, taking the speed range (0, W1] as an example, when it is within the speed range (0, W1], the speed range is evenly divided into n levels, n≥1, that is, there are speeds m1, m2, m3...mn (where mn=W1), and the power values ​​at the speeds m1, m2, m3...mN are calculated respectively. An external fan speed that can reduce the energy consumption of the air-conditioning system is selected, and the external fan of the air-conditioning system is controlled to operate at the external fan speed that can reduce the energy consumption of the air-conditioning system.

[0038] Wherein, when the current pressure load of the air conditioning system is greater than or equal to the maximum load level among the N load levels, the current speed of the external fan of the air conditioning system is determined to be the set maximum speed of the external fan. For example: when the pressure load SN is greater than the pressure load SN, and the external fan is running at the maximum speed WN, there is no need to calculate the power of the air conditioning system because it is the maximum speed without a speed range.

[0039] In step S130, n levels of rotational speeds within the current rotational speed range of the external fan of the air-conditioning system are determined to obtain n rotational speeds, where n is a positive integer and n≥1.

[0040] In some embodiments, determining n levels of rotational speed within the current external fan speed range of the air-conditioning system in step S130 to obtain n rotational speeds includes: evenly dividing the current external fan speed range of the air-conditioning system into n levels of rotational speed within the external fan speed range of the air-conditioning system to obtain n rotational speeds. Here, each of the external fan speed ranges of the air-conditioning system in the N external fan speed ranges of the air-conditioning system is evenly divided into n levels of rotational speed. Among them, the division of the n levels of rotational speed within the current external fan speed range of the air-conditioning system may be completed in the correspondence between the pressure load of the air-conditioning system and the external fan speed range of the air-conditioning system, or may be divided on the spot according to the current external fan speed range of the air-conditioning system.

[0041] In step S140, the internal and external fans of the air-conditioning system are controlled to run at each of the n speeds.

[0042] At step S150, when the indoor and outdoor fans of the air-conditioning system are running at each of the n speeds, the DC bus voltage of the DC bus power supply of the air-conditioning system and the DC bus current of the DC bus power supply of the air-conditioning system are obtained, which are recorded as the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at the speed. Specifically, the DC bus voltage of the DC bus power supply of the air-conditioning system is obtained, which is recorded as the DC bus voltage of the air-conditioning system. And the DC bus current of the DC bus power supply of the air-conditioning system is obtained, which is recorded as the DC bus current of the air-conditioning system. Figure 5 As shown, the speed control device of the internal and external fans in the air-conditioning system, that is, the speed control structure of the external fan of the air-conditioning system for implementing the speed control method of the internal and external fans in the air-conditioning system, mainly includes: a current detection module (that is, a DC bus current detection module), and a voltage detection module (that is, a DC bus voltage detection module). The current detection module and the voltage detection module are respectively connected to the DC bus power supply of the air-conditioning system and the external fan speed control module. The pressure detection module is respectively connected to the air-conditioning system and the external fan speed control module. Among them, the DC bus current detection module is used to detect the current value of the DC bus power supply to obtain the DC bus power supply current I dc The DC bus voltage detection module is used to detect the voltage value of the DC bus power supply to obtain the DC bus power supply voltage U of the air conditioning system. dc The sampling interval of the DC bus current detection module and the DC bus voltage detection module is Ts, and Ts>0. The instantaneous power P of the air conditioning system is obtained by multiplying the current and voltage, where P=Udc ×I dc Therefore, here we take the average value of the instantaneous power P obtained by sampling within time T to obtain the final power of the air conditioning system

[0043] At step S160, when the internal and external fans of the air-conditioning system are operated at each of the n speeds, the power of the air-conditioning system at the speed is determined according to the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at any of the n speeds, thereby obtaining n powers of the air-conditioning system at the n speeds. Specifically, the power of the air-conditioning system at the speed is determined according to the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system when the internal and external fans of the air-conditioning system are operated at each of the n speeds, and by analogy, the power of the air-conditioning system when the internal and external fans of the air-conditioning system are operated at all of the n speeds is obtained, which is recorded as the n powers of the air-conditioning system at the n speeds.

[0044] In some embodiments, in step S160, when the internal and external fans of the air-conditioning system are operated at each of the n speeds, the specific process of determining the power of the air-conditioning system at any of the n speeds is determined based on the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at the speed, see the following exemplary description.

[0045] Combine the following Figure 2 The flowchart of an embodiment of determining the power of the air-conditioning system at each speed in the method of the present invention is shown, which further illustrates the specific process of determining the power of the air-conditioning system at each speed in step S160, including: step S210 to step S220.

[0046] Step S210, when the internal and external fans of the air-conditioning system are running at each of the n speeds, the instantaneous power of the air-conditioning system at the speed is determined according to the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system obtained at a set sampling time interval at any of the n speeds.

[0047] Step S220: determining the average value of the instantaneous power of the air-conditioning system obtained within a set sampling period at the speed as the power of the air-conditioning system at the speed.

[0048] Specifically, Figure 6 FIG. 1 is a flow chart of an embodiment of a method for controlling the speed of an indoor and outdoor fan in an air conditioning system. Figure 6 As shown, the solution of the present invention proposes a method for controlling the speed of an indoor and outdoor fan in an air-conditioning system, comprising:

[0049] Step 1: Divide the pressure load S of the air-conditioning system into N levels (preferably evenly divided), N is a positive integer, and N≥1, that is, there are pressure load levels S1, S2, S3...SN, and the external fan has a corresponding level of speed range W1, W2, W3...WN under different pressure load levels (such as pressure load levels S1, S2, S3...SN), where WN is the maximum speed of the external fan, that is, the pressure load range (0, S1] corresponds to the external fan speed range (0, W1], the pressure load range (S1, S2] corresponds to the external fan speed range (W1, W2], and the pressure load range (S2, S3] corresponds to the external fan speed range (W2, W3], ..., the corresponding external fan speed range within the pressure load range (SN-1, SN] is (WN-1, WN], and the fan above the pressure load SN runs at the highest speed WN other than the external fan. Furthermore, the external fan speed level is divided within each external fan speed range. Taking the pressure load (0, S1] as an example, when it is within the speed range (0, W1], the speed range (0, W1] is divided into n levels, n is a positive integer, and n ≥ 1, that is, within the speed range (0, W1], there are speeds m1, m2, m3...mn, among which the speed m1 is greater than 0, the speed m2, the speed m3...the speed mn increase successively, and the speed mn = W1.

[0050] Step 2: When the air conditioning system is turned on and running, firstly, sampling is performed at the set sampling time Ts as the sampling interval to obtain the current pressure load value Si and DC bus voltage value U of the air conditioning system. dc and DC bus current value I dc .

[0051] Step 3: Then determine the pressure level range of the current pressure load value Si of the air-conditioning system among the pressure load levels S1, S2, S3...SN, so as to obtain the external fan speed range corresponding to the pressure level range.

[0052] Step 4: Then, the obtained external fan speed range is divided into N levels. Taking the speed range (0, W1] as an example, when it is within the speed range (0, W1], the speed range is divided into N levels, n ≥ 1, that is, there are speeds m1, m2, m3...mn (where mn = W1).

[0053] In step S170, a speed level corresponding to the minimum power among the n powers of the air-conditioning system under the n speeds is determined as the current speed of the indoor and outdoor fans of the air-conditioning system, and the indoor and outdoor fans of the air-conditioning system are controlled to operate at the current speed.

[0054] For example: for the speeds m1, m2, m3…mn in the speed range (0, W1], calculate the power values ​​at speeds m1, m2, m3…mN respectively. The power value calculated based on the speed m1, speed m2, speed m3...speed mN The speed with the smallest power value is selected as the speed of the external fan with lower energy consumption of the air-conditioning system, so as to select the speed of the external fan that can make the air-conditioning system consume less energy, and control the external fan of the air-conditioning system to operate at the speed of the external fan that can make the air-conditioning system consume less energy.

[0055] The scheme of the present invention proposes a method for controlling the speed of the external fan of an air-conditioning system, which divides the pressure load level of the air-conditioning system, corresponds to different external fan speed ranges under different pressure load levels, divides the external fan speed level within each external fan speed range, and calculates and switches the energy consumption of the air-conditioning system during the operation of the air-conditioning system by switching the external fan speed level, and selects the wind speed (i.e., the external fan speed) that can minimize the overall energy consumption of the air-conditioning system to operate, so that the external fan speed can well match the load demand of the air-conditioning system. In this way, by defining the external fan speed range according to the pressure load of the air-conditioning system during the operation of the air-conditioning system, dividing the external fan speed range into multiple levels, and finding the wind speed level that makes the external fan of the air-conditioning system operate at the lowest energy consumption, it is beneficial to make the external fan speed well match the load demand of the air-conditioning system, so that the air-conditioning system can operate stably, and the energy consumption of the air-conditioning system can be reduced, thereby solving the problem of energy waste of the external fan of the air-conditioning system and achieving the purpose of energy saving.

[0056] In some embodiments, the control method of the air-conditioning system described in the solution of the present invention further includes: when the operating conditions of the air-conditioning system change, a process of re-determining the current rotation speed of the internal and external fans of the air-conditioning system.

[0057] Combine the following Figure 3 The flowchart of an embodiment of the method of the present invention for redetermining the current rotation speed of the internal and external fans in the air-conditioning system further illustrates the specific process of redetermining the current rotation speed of the internal and external fans in the air-conditioning system, including: step S310 to step S330.

[0058] Step S310, determining whether the operating condition of the air conditioning system has changed.

[0059] Step S320: When it is determined that the operating condition of the air-conditioning system has changed, the current pressure load of the compressor in the air-conditioning system is re-acquired, and recorded as the re-acquired current pressure load of the air-conditioning system.

[0060] Step S330, based on the re-acquired current pressure load of the air-conditioning system, re-determine the current speed of the inner and outer fans of the air-conditioning system, and control the inner and outer fans of the air-conditioning system to operate at the current speed. The process of re-determining the current speed of the inner and outer fans of the air-conditioning system is described in detail in steps S120 to S170, which will not be described in detail here.

[0061] In the scheme of the present invention, the speed range of the external fan is defined according to the pressure load of the air-conditioning system. For example, according to the pressure load S of the air-conditioning system, a corresponding speed range W1, W2, W3...WN is defined for the external fan under different pressure load levels. The defined speed range of the external fan is divided into multiple speed levels, that is, multiple speed levels are divided in each speed range of the external fan. For example, within the speed range (0, W1], the speed range is divided into n levels, that is, there are speeds m1, m2, m3...mn (where mn=W1). The wind speed level that minimizes the energy consumption of the air-conditioning system is found and the external fan is controlled to operate at the wind speed level, so that the speed of the external fan can be well matched with the load demand of the air-conditioning system, thereby achieving the purpose of energy saving.

[0062] The technical solution of this embodiment is adopted, and the pressure load of the air-conditioning system is divided into N load levels in advance, so that each load level corresponds to an external fan speed range. For each external fan speed range, the speed is divided into n levels. When the air-conditioning system is turned on and running, the current pressure load of the air-conditioning system, the bus voltage value of the air-conditioning system, and the bus current value of the air-conditioning system are detected according to the set sampling time interval, and the instantaneous power P of the air-conditioning can be calculated according to the detected bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system. According to the detected current pressure load of the air-conditioning system, the corresponding load level of the current pressure load of the air-conditioning system in the N load levels is determined, and the n levels of speed corresponding to the external fan speed periphery corresponding to the corresponding load level are determined. Based on the detected bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system, the n average powers of the air-conditioning system at the n speeds corresponding to the external fan speed periphery corresponding to the corresponding load level are calculated (such as the power of the air-conditioning system ), from the n average powers of the air conditioning system (such as the power of the air conditioning system ), and determine a speed corresponding to the minimum power value from the n speeds corresponding to the outer periphery of the external fan speed corresponding to the corresponding load level, as the current speed of the external fan of the air-conditioning system, and control the external fan of the air-conditioning system to operate at the current speed of the external fan. Thus, by defining the speed range of the external fan according to the pressure load of the air-conditioning system, the external fan of the air-conditioning system operates at the wind speed level with the lowest energy consumption, thereby reducing the energy consumption of the air-conditioning system.

[0063] According to an embodiment of the present invention, a control device for an air conditioning system corresponding to the control method for the air conditioning system is also provided. Figure 4 The structure diagram of an embodiment of the device of the present invention is shown. The air conditioning system has a compressor, an external fan and a DC bus power supply. The control device of the air conditioning system includes: an acquisition unit 102 and a control unit 104.

[0064] The acquisition unit 102 is configured to acquire the current pressure load of the compressor in the air conditioning system when the air conditioning system is turned on and running, and record it as the current pressure load of the air conditioning system. The specific functions and processing of the acquisition unit 102 refer to step S110.

[0065] In some implementations, the acquisition unit 102 acquires the current pressure load of the compressor in the air-conditioning system, recorded as the current pressure load of the air-conditioning system, including: the acquisition unit 102 is further configured to acquire the pressure load of the compressor in the air-conditioning system at a set sampling time interval, and determine the average value of the pressure load of the compressor in the air-conditioning system sampled within the set sampling period as the current pressure load of the compressor in the air-conditioning system, recorded as the current pressure load of the air-conditioning system. Wherein, a sampling time interval such as time Ts is set, a sampling period such as time T is set, and the average value of the pressure loads of several compressors in the air-conditioning system sampled at a set sampling period such as time T at a set sampling time interval such as time Ts is determined as the current pressure load of the compressor in the air-conditioning system.

[0066] Specifically, Figure 5 FIG. 1 is a schematic diagram of a structure of an embodiment of a speed control device for an indoor and outdoor fan in an air conditioning system. Figure 5 As shown, the speed control device of the inner and outer fans of the air-conditioning system, that is, the speed control structure of the outer fan of the air-conditioning system for realizing the speed control device of the inner and outer fans of the air-conditioning system, mainly includes: a pressure detection module and an outer fan speed control module. The pressure detection module is connected to the air-conditioning system and the outer fan speed control module respectively. Among them, the pressure detection module is used to detect the pressure load S of the compressor inside the air-conditioning system, which is used to help control the speed of the outer fan.

[0067] The control unit 104 is configured to determine the current external fan speed range of the internal and external fans of the air conditioning system corresponding to the current pressure load of the air conditioning system, which is recorded as the current external fan speed range of the air conditioning system. The specific functions and processing of the control unit 104 refer to step S120.

[0068] In some embodiments, the control unit 104 determines the current external fan speed range of the internal and external fan of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, which is recorded as the current external fan speed range of the air-conditioning system, including: the control unit 104 is further configured to determine the external fan speed range of the air-conditioning system corresponding to the pressure load of the air-conditioning system that is the same as the current pressure load of the air-conditioning system in the corresponding relationship according to the pre-set correspondence between the pressure load of the air-conditioning system and the external fan speed range of the air-conditioning system, as the external fan speed range of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, which is recorded as the current external fan speed range of the air-conditioning system.

[0069] The control unit 104 pre-sets the corresponding relationship between the pressure load of the air-conditioning system and the speed range of the external fan of the air-conditioning system, including: the control unit 104 is further configured to divide the pressure load of the air-conditioning system into N load levels, N is a positive integer, and N≥1. Each load level in the N load levels corresponds to a speed range of the external fan of the air-conditioning system.

[0070] See also Figure 5 In the example shown, the external fan speed control module adjusts the external fan speed according to the condition of the air-conditioning system. First, the pressure load S of the air-conditioning system is divided into N levels, N≥1, that is, there are pressure load levels S1, S2, S3...SN. Under different pressure load levels, the external fan has a corresponding level of speed range W1, W2, W3...WN, where WN is the maximum speed of the external fan, that is, the pressure load (0, S1] range corresponds to the external fan speed range (0, W1], the pressure load (S1, S2] range corresponds to the external fan speed range (W1, W2], and the pressure load SN is above the maximum fan speed WN. Then the corresponding speed range of a level is divided into levels, that is, taking the speed range (0, W1] as an example, when it is within the speed range (0, W1], the speed range is evenly divided into n levels, n≥1, that is, there are speeds m1, m2, m3...mn (where mn=W1), and the power values ​​at the speeds m1, m2, m3...mN are calculated respectively. An external fan speed that can reduce the energy consumption of the air-conditioning system is selected, and the external fan of the air-conditioning system is controlled to operate at the external fan speed that can reduce the energy consumption of the air-conditioning system.

[0071] The control unit 104 is further configured to determine that the current speed of the external fan in the air-conditioning system is the set maximum speed of the external fan when the current pressure load of the air-conditioning system is greater than or equal to the maximum load level among the N load levels. For example, when the pressure load SN is greater than or equal to the pressure load SN, and the external fan is running at the maximum speed WN, there is no need to calculate the power of the air-conditioning system because it is the maximum speed without a speed range.

[0072] The control unit 104 is further configured to determine n levels of rotation speed within the current rotation speed range of the external fan of the air conditioning system to obtain n rotation speeds, where n is a positive integer and n≥1. The specific functions and processing of the control unit 104 are also shown in step S130.

[0073] In some embodiments, the control unit 104 determines n levels of rotational speed within the current external fan speed range of the air-conditioning system to obtain n rotational speeds, including: the control unit 104 is specifically further configured to evenly divide the current external fan speed range of the air-conditioning system into n levels of rotational speed within the external fan speed range of the air-conditioning system to obtain n rotational speeds. Here, each of the external fan speed ranges of the air-conditioning system in the N external fan speed ranges of the air-conditioning system is evenly divided into n levels of rotational speed. Among them, the division of the n levels of rotational speed within the current external fan speed range of the air-conditioning system may be completed in the correspondence between the pressure load of the air-conditioning system and the external fan speed range of the air-conditioning system, or may be divided on the spot according to the current external fan speed range of the air-conditioning system.

[0074] The control unit 104 is further configured to control the internal and external fans of the air conditioning system to operate at each of the n speeds. The specific functions and processing of the control unit 104 are also shown in step S140.

[0075] The acquisition unit 102 is also configured to acquire the DC bus voltage of the DC bus power supply of the air-conditioning system and the DC bus current of the DC bus power supply of the air-conditioning system when the internal and external fans of the air-conditioning system are running at each of the n speeds, and record them as the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at the speed. For the specific functions and processing of the acquisition unit 102, please refer to step S150. Specifically, the DC bus voltage of the DC bus power supply of the air-conditioning system is acquired, and recorded as the DC bus voltage of the air-conditioning system. And the DC bus current of the DC bus power supply of the air-conditioning system is acquired, and recorded as the DC bus current of the air-conditioning system. Figure 5As shown, the speed control device of the internal and external fans in the air-conditioning system, i.e., the speed control structure of the external fan of the air-conditioning system for realizing the speed control device of the internal and external fans in the air-conditioning system, mainly includes: a current detection module (i.e., a DC bus current detection module) and a voltage detection module (i.e., a DC bus voltage detection module). The current detection module and the voltage detection module are respectively connected to the DC bus power supply of the air-conditioning system and the external fan speed control module. The pressure detection module is respectively connected to the air-conditioning system and the external fan speed control module. Among them, the DC bus current detection module is used to detect the current value of the DC bus power supply to obtain the DC bus power supply current I dc The DC bus voltage detection module is used to detect the voltage value of the DC bus power supply to obtain the DC bus power supply voltage U of the air conditioning system. dc The sampling interval of the DC bus current detection module and the DC bus voltage detection module is Ts, and Ts>0. The instantaneous power P of the air conditioning system is obtained by multiplying the current and voltage, where P=U dc ×I dc Therefore, here we take the average value of the instantaneous power P obtained by sampling within time T to obtain the final power of the air conditioning system

[0076] The control unit 104 is also configured to determine the power of the air-conditioning system at any speed among the n speeds according to the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system when the internal and external fans of the air-conditioning system are running at each speed among the n speeds, thereby obtaining n powers of the air-conditioning system at the n speeds. The specific functions and processing of the control unit 104 are also shown in step S160. Specifically, according to the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system when the internal and external fans of the air-conditioning system are running at each speed among the n speeds, the power of the air-conditioning system at the speed is determined, and so on, the power of the air-conditioning system when the internal and external fans of the air-conditioning system are running at all speeds among the n speeds is obtained, which is recorded as the n powers of the air-conditioning system at the n speeds.

[0077] In some implementations, the control unit 104 determines the power of the air-conditioning system at any speed among the n speeds according to the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at the speed when the external fan of the air-conditioning system operates at each of the n speeds, including:

[0078] The control unit 104 is further configured to determine the instantaneous power of the air-conditioning system at any speed among the n speeds according to the DC bus voltage and the DC bus current of the air-conditioning system obtained at a set sampling time interval when the internal and external fans of the air-conditioning system are running at each of the n speeds. The specific functions and processing of the control unit 104 are also referred to step S210.

[0079] The control unit 104 is further configured to determine the average value of the instantaneous power of the air conditioning system obtained within a set sampling period at the speed as the power of the air conditioning system at the speed. The specific functions and processing of the control unit 104 are also shown in step S220.

[0080] Specifically, Figure 6 FIG. 1 is a flow chart of an embodiment of a speed control device for an indoor and outdoor fan in an air conditioning system. Figure 6 As shown, the solution of the present invention proposes a speed control device for an indoor and outdoor fan in an air-conditioning system, comprising:

[0081] Step 1: Divide the pressure load S of the air-conditioning system into N levels in advance, where N is a positive integer and N≥1, that is, there are pressure load levels S1, S2, S3...SN. Under different pressure load levels (such as pressure load levels S1, S2, S3...SN), the external fan has a corresponding speed range of one level W1, W2, W3...WN, where WN is the maximum speed of the external fan, that is, the pressure load range (0, S1] corresponds to the external fan speed range of (0, W1], the pressure load range (S1, S2] corresponds to the external fan speed range of (W1, W2], and the pressure load range (S2, S3] corresponds to the external fan speed range of (W 2, W3], ..., the corresponding external fan speed range within the pressure load (SN-1, SN] is (WN-1, WN], and the fan above the pressure load SN runs at the highest speed WN other than the external fan. Furthermore, the external fan speed level is divided within each external fan speed range. Taking the pressure load (0, S1] as an example, when it is within the speed range (0, W1], the speed range (0, W1] is divided into n levels, n is a positive integer, and n ≥ 1, that is, within the speed range (0, W1], there are speeds m1, m2, m3...mn, among which the speed m1 is greater than 0, the speed m2, the speed m3...the speed mn increase successively, and the speed mn = W1.

[0082] Step 2: When the air conditioning system is turned on and running, firstly, sampling is performed at the set sampling time Ts as the sampling interval to obtain the current pressure load value Si and DC bus voltage value U of the air conditioning system. dc and DC bus current value I dc .

[0083] Step 3: Then determine the pressure level range of the current pressure load value Si of the air-conditioning system among the pressure load levels S1, S2, S3...SN, so as to obtain the external fan speed range corresponding to the pressure level range.

[0084] Step 4: Then, the obtained external fan speed range is divided into N levels. Taking the speed range (0, W1] as an example, when it is within the speed range (0, W1], the speed range is divided into N levels, n ≥ 1, that is, there are speeds m1, m2, m3...mn (where mn = W1).

[0085] Step 5: Finally, calculate and process the air conditioning system power values ​​at speed levels m1, m2, m3…mN Select the external fan speed that minimizes the air conditioning system power value.

[0086] Specifically, the power of the air conditioning system is calculated at each speed (i.e., speed m1, m2, m3...mn) The power of each air conditioning system calculated based on each speed (i.e., speed m1, m2, m3…mn) In the embodiment of the present invention, a speed of an external fan that can reduce the energy consumption of the air-conditioning system is selected, and the external fan of the air-conditioning system is controlled to operate at the speed of the external fan that can reduce the energy consumption of the air-conditioning system.

[0087] Among them, the instantaneous power P of the air conditioning system is the DC bus power supply voltage U of the air conditioning system. dc and DC bus supply current I dc The product of, as shown in formula (1), the instantaneous power P of the air conditioning system is:

[0088] P=U dc ×I dc (1).

[0089] Assume that the DC bus supply voltage U of the air conditioning system dc and DC bus supply current I dc The sampling interval for sampling is the set sampling time Ts, and Ts>0. Then, within a sampling time T with the set sampling time Ts as the sampling interval, the DC bus power supply voltage U of the air conditioning system obtained based on the sampling is dc and DC bus supply current I de The calculated instantaneous power P is averaged according to the sampling times within the sampling time T and the sampling interval set as the sampling time Ts to obtain the final power of the air conditioning system.

[0090] The control unit 104 is further configured to determine a level of speed corresponding to the minimum power among the n powers of the air-conditioning system at the n speeds as the current speed of the internal and external fans of the air-conditioning system, and control the internal and external fans of the air-conditioning system to operate at the current speed. The specific functions and processing of the control unit 104 are also shown in step S170.

[0091] For example: for the speeds m1, m2, m3…mn in the speed range (0, W1], calculate the power values ​​at speeds m1, m2, m3…mN respectively. The power value calculated based on the speed m1, speed m2, speed m3...speed mN The speed with the smallest power value is selected as the speed of the external fan with lower energy consumption of the air-conditioning system, so as to select the speed of the external fan that can make the air-conditioning system consume less energy, and control the external fan of the air-conditioning system to operate at the speed of the external fan that can make the air-conditioning system consume less energy.

[0092] The scheme of the present invention proposes an air-conditioning system external fan speed control device, which divides the pressure load level of the air-conditioning system, corresponds to different external fan speed ranges under different pressure load levels, divides the external fan speed level within each external fan speed range, and calculates and switches the energy consumption of the air-conditioning system during the operation of the air-conditioning system by switching the external fan speed level, and selects the wind speed (i.e., external fan speed) that can minimize the overall energy consumption of the air-conditioning system, so that the external fan speed can well match the load demand of the air-conditioning system. In this way, by defining the external fan speed range according to the pressure load of the air-conditioning system during the operation of the air-conditioning system, dividing the external fan speed range into multiple levels, and finding the wind speed level that makes the external fan of the air-conditioning system run at the lowest energy consumption, it is beneficial to make the external fan speed well match the load demand of the air-conditioning system, so that the air-conditioning system can operate stably, and the energy consumption of the air-conditioning system can be reduced, thereby solving the problem of energy waste of the air-conditioning external fan and achieving the purpose of energy saving.

[0093] In some embodiments, the control device of the air-conditioning system described in the solution of the present invention further includes: a process of re-determining the current rotation speed of the internal and external fans of the air-conditioning system when the operating conditions of the air-conditioning system change.

[0094] The control unit 104 is further configured to determine whether the operating condition of the air conditioning system has changed. The specific functions and processing of the control unit 104 are also shown in step S310.

[0095] The acquisition unit 102 is further configured to re-acquire the current pressure load of the compressor in the air-conditioning system when it is determined that the operating condition of the air-conditioning system has changed, and record it as the re-acquired current pressure load of the air-conditioning system. The specific function and processing of the acquisition unit 102 can also be seen in step S320.

[0096] The control unit 104 is also configured to re-determine the current speed of the internal and external fans of the air-conditioning system according to the re-acquired current pressure load of the air-conditioning system, and control the internal and external fans of the air-conditioning system to operate at the current speed. The specific functions and processing of the control unit 104 are also referred to step S330. Among them, the process of re-determining the current speed of the internal and external fans of the air-conditioning system is referred to the relevant description of steps S120 to step S170, which will not be repeated here.

[0097] In the scheme of the present invention, the speed range of the external fan is defined according to the pressure load of the air-conditioning system. For example, according to the pressure load S of the air-conditioning system, a corresponding speed range W1, W2, W3...WN is defined for the external fan under different pressure load levels. The defined speed range of the external fan is divided into multiple speed levels, that is, multiple speed levels are divided in each speed range of the external fan. For example, within the speed range (0, W1], the speed range is divided into n levels, that is, there are speeds m1, m2, m3...mn (where mn=W1). The wind speed level that minimizes the energy consumption of the air-conditioning system is found and the external fan is controlled to operate at the wind speed level, so that the speed of the external fan can be well matched with the load demand of the air-conditioning system, thereby achieving the purpose of energy saving.

[0098] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0099] According to the technical solution of the present invention, the pressure load of the air-conditioning system is divided into N load levels in advance, so that each load level corresponds to an external fan speed range; for each external fan speed range, the speed is divided into n levels; when the air-conditioning system is turned on and running, the current pressure load of the air-conditioning system, the bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system are detected at a set sampling time interval, and the instantaneous power P of the air-conditioning can be calculated according to the detected bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system; according to the detected current pressure load of the air-conditioning system, the corresponding load level of the current pressure load of the air-conditioning system in the N load levels is determined, and the n levels of speed corresponding to the external fan speed periphery corresponding to the corresponding load level are determined; based on the detected bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system, the n average powers of the air-conditioning system at the n speeds corresponding to the external fan speed periphery corresponding to the corresponding load level are calculated (such as the power of the air-conditioning system ), from the n average powers of the air conditioning system (such as the power of the air conditioning system ), and determine a speed corresponding to the minimum power value from the n speeds corresponding to the outer periphery of the external fan speed corresponding to the corresponding load level, as the current speed of the external fan of the air-conditioning system, and control the external fan of the air-conditioning system to operate at the current speed of the external fan, which is conducive to making the external fan speed well match the load demand of the air-conditioning system, and can reduce the energy consumption of the air-conditioning system.

[0100] According to an embodiment of the present invention, an air conditioning system corresponding to the control device of the air conditioning system is also provided. The air conditioning system may include: the control device of the air conditioning system described above.

[0101] Since the processing and functions implemented by the air-conditioning system of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for the details not described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0102] According to the technical solution of the present invention, the pressure load of the air-conditioning system is divided into N load levels in advance, so that each load level corresponds to an external fan speed range; for each external fan speed range, the speed is divided into n levels; when the air-conditioning system is turned on and running, the current pressure load of the air-conditioning system, the bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system are detected at a set sampling time interval, and the instantaneous power P of the air-conditioning can be calculated according to the detected bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system; according to the detected current pressure load of the air-conditioning system, the corresponding load level of the current pressure load of the air-conditioning system in the N load levels is determined, and the n levels of speed corresponding to the external fan speed periphery corresponding to the corresponding load level are determined; based on the detected bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system, the n average powers of the air-conditioning system at the n speeds corresponding to the external fan speed periphery corresponding to the corresponding load level are calculated (such as the power of the air-conditioning system ), from the n average powers of the air conditioning system (such as the power of the air conditioning system ), and determine a speed corresponding to the minimum power value from the n speeds corresponding to the external fan speed corresponding to the corresponding load level, as the current speed of the external fan of the air-conditioning system, and control the external fan of the air-conditioning system to run at the current speed of the external fan, so that the air-conditioning system can run stably, and the energy consumption of the air-conditioning system can be reduced.

[0103] According to an embodiment of the present invention, a storage medium corresponding to the control method of the air-conditioning system is also provided, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the control method of the air-conditioning system described above.

[0104] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0105] According to the technical solution of the present invention, the pressure load of the air-conditioning system is divided into N load levels in advance, so that each load level corresponds to an external fan speed range; for each external fan speed range, the speed is divided into n levels; when the air-conditioning system is turned on and running, the current pressure load of the air-conditioning system, the bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system are detected at a set sampling time interval, and the instantaneous power P of the air-conditioning can be calculated according to the detected bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system; according to the detected current pressure load of the air-conditioning system, the corresponding load level of the current pressure load of the air-conditioning system in the N load levels is determined, and the n levels of speed corresponding to the external fan speed periphery corresponding to the corresponding load level are determined; based on the detected bus voltage value of the air-conditioning system and the bus current value of the air-conditioning system, the n average powers of the air-conditioning system at the n speeds corresponding to the external fan speed periphery corresponding to the corresponding load level are calculated (such as the power of the air-conditioning system ), from the n average powers of the air conditioning system (such as the power of the air conditioning system ), and determine a speed corresponding to the minimum power value from the n speeds corresponding to the external fan speed corresponding to the corresponding load level, as the current speed of the external fan of the air-conditioning system, and control the external fan of the air-conditioning system to operate at the current speed of the external fan, so that the speed of the external fan can be well matched with the load demand of the air-conditioning system, thereby achieving the purpose of energy saving.

[0106] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0107] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A control method for an air conditioning system, It is characterized in that include: When the air-conditioning system is started and running, obtaining a current pressure load of the compressor in the air-conditioning system, and recording it as the current pressure load of the air-conditioning system; Determine a current external fan speed range of the external fan of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, recorded as the current external fan speed range of the air-conditioning system; Determine n levels of rotation speed within a current rotation speed range of the external fan of the air conditioning system to obtain n rotation speeds, where n is a positive integer and n≥1; Controlling the inner and outer fans of the air conditioning system to operate at each of the n speeds; When the internal and external fans of the air-conditioning system are operated at each of the n speeds, a DC bus voltage of a DC bus power supply of the air-conditioning system and a DC bus current of a DC bus power supply of the air-conditioning system are obtained, and recorded as the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at the speed; Determine the power of the air-conditioning system at any speed among the n speeds according to the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at the speed, thereby obtaining n powers of the air-conditioning system at the n speeds; A speed level corresponding to the minimum power among the n powers of the air-conditioning system under the n speeds is determined as the current speed of the indoor and outdoor fans of the air-conditioning system, and the indoor and outdoor fans of the air-conditioning system are controlled to operate at the current speed.

2. The control method of the air conditioning system according to claim 1, It is characterized in that in, Acquiring a current pressure load of the compressor in the air-conditioning system, recorded as the current pressure load of the air-conditioning system, includes: Acquire the pressure load of the compressor in the air-conditioning system at a set sampling time interval, and determine the average value of the pressure load of the compressor in the air-conditioning system sampled within the set sampling period as the current pressure load of the compressor in the air-conditioning system, which is recorded as the current pressure load of the air-conditioning system; and / or, Determine n levels of speed within the current speed range of the external fan of the air conditioning system to obtain n speeds, including: The current external fan speed range of the air-conditioning system is evenly divided into n levels of speed within the external fan speed range of the air-conditioning system to obtain n speeds.

3. The control method of the air conditioning system according to claim 1, It is characterized in that Determining a current external fan speed range of the external fan of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, recorded as the current external fan speed range of the air-conditioning system, includes: According to a preset correspondence between the pressure load of the air-conditioning system and the external fan speed range of the air-conditioning system, the external fan speed range of the air-conditioning system corresponding to the pressure load of the air-conditioning system that is the same as the current pressure load of the air-conditioning system in the correspondence is determined as the external fan speed range of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, and recorded as the current external fan speed range of the air-conditioning system; Wherein, presetting the correspondence between the pressure load of the air-conditioning system and the speed range of the external fan of the air-conditioning system comprises: dividing the pressure load of the air-conditioning system into N load levels, N is a positive integer, and N≥1; each load level in the N load levels corresponds to a speed range of the external fan of the air-conditioning system; Wherein, when the current pressure load of the air-conditioning system is greater than or equal to the maximum load level among N load levels, the current speed of the external fan of the air-conditioning system is determined to be the set maximum speed of the external fan.

4. The control method of the air conditioning system according to claim 1, It is characterized in that Determining the power of the air-conditioning system at any speed among the n speeds according to the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at the speed includes: Determine the instantaneous power of the air-conditioning system at any speed among the n speeds according to the DC bus voltage and the DC bus current of the air-conditioning system obtained at a set sampling time interval at the speed; The average value of the instantaneous power of the air-conditioning system obtained within a set sampling period at the speed is determined as the power of the air-conditioning system at the speed.

5. The control method of the air conditioning system according to any one of claims 1 to 4, It is characterized in that Also includes: determining whether the operating condition of the air conditioning system has changed; In the case where it is determined that the operating condition of the air-conditioning system has changed, the current pressure load of the compressor in the air-conditioning system is re-acquired, and recorded as the re-acquired current pressure load of the air-conditioning system; According to the re-acquired current pressure load of the air-conditioning system, the current rotation speed of the internal and external fans of the air-conditioning system is re-determined, and the internal and external fans of the air-conditioning system are controlled to operate at the current rotation speed.

6. A control device for an air conditioning system, It is characterized in that include: an acquisition unit, configured to acquire a current pressure load of the compressor in the air-conditioning system when the air-conditioning system is started and running, and record the current pressure load of the air-conditioning system; a control unit configured to determine a current external fan speed range of the external fan of the air-conditioning system corresponding to a current pressure load of the air-conditioning system, recorded as a current external fan speed range of the air-conditioning system; The control unit is further configured to determine n levels of rotational speed within a current rotational speed range of the external fan of the air conditioning system to obtain n rotational speeds, where n is a positive integer and n≥1; The control unit is further configured to control the inner and outer fans of the air conditioning system to operate at each of the n speeds; The acquisition unit is further configured to acquire a DC bus voltage of a DC bus power supply of the air-conditioning system and a DC bus current of a DC bus power supply of the air-conditioning system when the internal and external fans of the air-conditioning system are running at each of the n speeds, and record them as the DC bus voltage of the air-conditioning system and the DC bus current of the air-conditioning system at the speed; The control unit is further configured to determine the power of the air-conditioning system at any speed among the n speeds according to the DC bus voltage and the DC bus current of the air-conditioning system at the speed, thereby obtaining n powers of the air-conditioning system at the n speeds; The control unit is also configured to determine a level of speed corresponding to the minimum power among the n powers of the air-conditioning system under the n speeds as the current speed of the indoor and outdoor fans of the air-conditioning system, and control the indoor and outdoor fans of the air-conditioning system to operate at the current speed.

7. The control device for an air conditioning system according to claim 6, It is characterized in that in, The obtaining unit obtains the current pressure load of the compressor in the air-conditioning system, recorded as the current pressure load of the air-conditioning system, including: Acquire the pressure load of the compressor in the air-conditioning system at a set sampling time interval, and determine the average value of the pressure load of the compressor in the air-conditioning system sampled within the set sampling period as the current pressure load of the compressor in the air-conditioning system, which is recorded as the current pressure load of the air-conditioning system; and / or, The control unit determines n levels of rotation speed within a current rotation speed range of the external fan of the air conditioning system to obtain n rotation speeds, including: The current external fan speed range of the air-conditioning system is evenly divided into n levels of speed within the external fan speed range of the air-conditioning system to obtain n speeds.

8. The control device for an air conditioning system according to claim 6, It is characterized in that The control unit determines a current external fan speed range of the external fan of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, which is recorded as the current external fan speed range of the air-conditioning system, including: According to a preset correspondence between the pressure load of the air-conditioning system and the external fan speed range of the air-conditioning system, the external fan speed range of the air-conditioning system corresponding to the pressure load of the air-conditioning system that is the same as the current pressure load of the air-conditioning system in the correspondence is determined as the external fan speed range of the air-conditioning system corresponding to the current pressure load of the air-conditioning system, and recorded as the current external fan speed range of the air-conditioning system; The control unit pre-sets the corresponding relationship between the pressure load of the air-conditioning system and the speed range of the external fan of the air-conditioning system, including: dividing the pressure load of the air-conditioning system into N load levels, N is a positive integer, and N≥1; each load level in the N load levels corresponds to a speed range of the external fan of the air-conditioning system; Wherein, the control unit is further configured to determine that the current speed of the external fan in the air-conditioning system is the set maximum speed of the external fan when the current pressure load of the air-conditioning system is greater than or equal to the maximum load level among N load levels.

9. The control device for an air conditioning system according to claim 6, It is characterized in that The control unit determines the power of the air-conditioning system at any speed among the n speeds according to the DC bus voltage and the DC bus current of the air-conditioning system at the speed, including: Determine the instantaneous power of the air-conditioning system at any speed among the n speeds according to the DC bus voltage and the DC bus current of the air-conditioning system obtained at a set sampling time interval at the speed; The average value of the instantaneous power of the air-conditioning system obtained within a set sampling period at the speed is determined as the power of the air-conditioning system at the speed.

10. The control device for an air conditioning system according to any one of claims 6 to 9, It is characterized in that Also includes: The control unit is further configured to determine whether the operating condition of the air conditioning system has changed; The acquisition unit is further configured to re-acquire the current pressure load of the compressor in the air-conditioning system when it is determined that the operating condition of the air-conditioning system has changed, and record it as the re-acquired current pressure load of the air-conditioning system; The control unit is further configured to re-determine the current rotation speed of the inner and outer fans of the air-conditioning system according to the re-acquired current pressure load of the air-conditioning system, and control the inner and outer fans of the air-conditioning system to operate at the current rotation speed.

11. An air conditioning system, It is characterized in that include: A control device for an air conditioning system according to any one of claims 6 to 10.

12. A storage medium, It is characterized in that The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the control method of the air-conditioning system according to any one of claims 1 to 5.

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