Ducted air conditioner and constant air volume control method, device and storage medium thereof

Abstract

The application discloses a duct type air conditioner and a constant air volume control method, device and storage medium thereof. The method comprises the following steps: obtaining the current rotating speed and current power of an indoor fan according to an air volume instruction; obtaining a plurality of first rotating speeds, wherein the plurality of first rotating speeds are corresponding rotating speeds of the indoor fan when the indoor fan outputs a plurality of preset air volumes respectively under a current static pressure and are related to the current rotating speed and current power; obtaining a second rotating speed according to the plurality of first rotating speeds and an air volume corresponding to the air volume instruction; and controlling the indoor fan to operate by using the second rotating speed, so that the air volume output by the indoor fan matches the air volume instruction. The method can obtain the second rotating speed according to the plurality of first rotating speeds and the air volume corresponding to the air volume instruction, and then control the indoor fan to obtain the air volume matching the air volume instruction, so that the required air volume can be output according to different air conditioner installation or use environments.

Description

Technical Field

[0001] This invention relates to the field of air conditioning control technology, and in particular to a duct air conditioner and its constant air volume control method, device, and storage medium. Background Technology

[0002] Air conditioners are common cooling devices in modern homes and often operate for extended periods. Over time, dust accumulates in the heat exchanger, leading to increased static pressure, reduced airflow, and decreased cooling efficiency. Furthermore, inconsistent duct length and height at the air outlet can also increase static pressure and reduce airflow, preventing the heat exchanger from performing sufficient heat exchange, lowering the energy efficiency ratio, and weakening the cooling effect. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a constant airflow control method for a ducted air conditioner. This method can obtain a second rotational speed based on the airflow corresponding to multiple first rotational speeds and airflow commands, and then control the indoor fan to obtain an airflow matching the airflow command. Since the first rotational speed is related to the current static pressure, it can output the required airflow according to the air conditioner's installation or usage environment, thus achieving airflow control under the current environment.

[0004] The second objective of this invention is to provide a duct-type air conditioner.

[0005] A third objective of this invention is to provide a computer-readable storage medium.

[0006] The fourth objective of this invention is to provide a constant air volume control device for a duct-type air conditioner.

[0007] To achieve the above objectives, a first aspect of the present invention provides a constant air volume control method for a ducted air conditioner, comprising: obtaining the current rotational speed and current power of an indoor fan according to an air volume command; obtaining a plurality of first rotational speeds, wherein the plurality of first rotational speeds are rotational speeds corresponding to the indoor fan outputting a plurality of preset air volumes under the current static pressure and are related to the current rotational speed and current power; obtaining a second rotational speed according to the plurality of first rotational speeds and the air volume corresponding to the air volume command; and controlling the operation of the indoor fan using the second rotational speed so that the air volume output by the indoor fan matches the air volume command.

[0008] According to the constant air volume control method of the duct air conditioner of the present invention, a second rotation speed can be obtained based on the air volume corresponding to multiple first rotation speeds and air volume commands, and then the indoor fan can be controlled to obtain an air volume that matches the air volume command. Since the first rotation speed is related to the current static pressure, the required air volume can be output according to the air conditioner installation or use environment to achieve air volume control under the current environment.

[0009] To achieve the above objectives, a second aspect of the present invention provides a ducted air conditioner, including a memory, a processor, and a constant air volume control program for the ducted air conditioner stored in the memory and executable on the processor. When the processor executes the constant air volume control program for the ducted air conditioner, it implements the constant air volume control method for the ducted air conditioner described in the above embodiment.

[0010] According to the duct air conditioner of the present invention, the constant air volume control method of the duct air conditioner described above can obtain a second rotation speed based on the air volume corresponding to multiple first rotation speeds and air volume commands, and then control the indoor fan to obtain an air volume that matches the air volume command. Since the first rotation speed is related to the current static pressure, it can output the required air volume according to the air conditioner installation or use environment, and realize air volume control in the current environment.

[0011] To achieve the above objectives, a third aspect of the present invention provides a computer-readable storage medium storing a constant air volume control program for a ducted air conditioner. When the constant air volume control program for the ducted air conditioner is executed by a processor, it implements the constant air volume control method for the ducted air conditioner described in the above embodiment.

[0012] According to the computer-readable storage medium of the present invention, the constant air volume control method of the duct air conditioner described above can obtain a second rotation speed based on the air volume corresponding to multiple first rotation speeds and air volume commands, and then control the indoor fan to obtain an air volume that matches the air volume command. Since the first rotation speed is related to the current static pressure, it can output the required air volume according to the air conditioner installation or usage environment, and realize air volume control under the current environment.

[0013] To achieve the above objectives, a fourth aspect of the present invention provides a constant air volume control device for a ducted air conditioner, comprising: an acquisition unit for acquiring the current speed and current power of an indoor fan according to an air volume command; and a control unit for acquiring multiple first speeds, acquiring a second speed according to the multiple first speeds and the air volume corresponding to the air volume command, and controlling the operation of the indoor fan using the second speed so that the air volume output by the indoor fan matches the air volume command, wherein the multiple first speeds are the speeds corresponding to the indoor fan outputting multiple preset air volumes under the current static pressure and are related to the current speed and current power.

[0014] According to the constant air volume control device of the duct air conditioner of the present invention, a second rotation speed can be obtained based on the air volume corresponding to multiple first rotation speeds and air volume commands, and then the indoor fan can be controlled to obtain an air volume that matches the air volume command. Since the first rotation speed is related to the current static pressure, the required air volume can be output according to the air conditioner installation or use environment to achieve air volume control under the current environment.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a flowchart illustrating a constant air volume control method for a ducted air conditioner according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram illustrating the process of obtaining the current rotational speed and current power according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram illustrating the acquisition of a second rotational speed according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of a constant air volume control device for a duct-type air conditioner according to an embodiment of the present invention. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] Figure 1 This is a flowchart illustrating a constant airflow control method for a ducted air conditioner according to an embodiment of the present invention. (Reference) Figure 1 As shown, the constant air volume control method for this ducted air conditioner may include:

[0023] S11: Obtain the current speed and power of the indoor fan based on the air volume command.

[0024] S13, obtain multiple first speeds, which are the speeds corresponding to the indoor fan outputting multiple preset air volumes under the current static pressure and are related to the current speed and the current power.

[0025] S15, obtain the second speed according to the air volume corresponding to multiple first speed and air volume commands.

[0026] S17 uses the second rotation speed to control the operation of the indoor fan so that the air volume output by the indoor fan matches the air volume command.

[0027] The above-mentioned constant air volume control method can obtain a second rotation speed based on the air volume corresponding to multiple first rotation speeds and air volume commands, and then control the indoor fan to obtain an air volume that matches the air volume command. Since the first rotation speed is related to the current static pressure, it can output the required air volume according to the air volume required by the air conditioner's installation or use environment, and realize air volume control in the current environment.

[0028] Specifically, a ducted air conditioner can be a ducted unit equipped with a squirrel-cage impeller, or other types of ducted units. The ducted unit can be an embedded ducted unit. A ducted unit may include a main body and an indoor heat exchanger and an indoor fan housed within the main body. The indoor fan includes a motor and an impeller, with the motor driving the impeller's rotation. The main body has an air outlet and a return air inlet. When the indoor heat exchanger accumulates a lot of dust due to prolonged operation, or when the static pressure increases due to inconsistent duct length or height, the airflow output by the indoor fan will decrease, leading to a decline in heat exchange efficiency.

[0029] Therefore, when the static pressure changes, an airflow command can be given, and the indoor fan can be controlled based on this airflow command. Specifically, the current speed and power of the indoor fan can be obtained based on the airflow command. Multiple first speeds corresponding to multiple preset airflows output by the indoor fan under the current speed, current power, and current static pressure can be obtained based on the multiple first speeds and the airflow corresponding to the airflow command. Then, the indoor fan can be controlled based on the second speed, so that the airflow output by the indoor fan matches the airflow command. Since the first speed is related to the current static pressure, the required airflow can be output according to the installation or use environment of the air conditioner, thus realizing airflow control under the current environment.

[0030] In some implementations, such as Figure 2 As shown, the current speed and power of the indoor fan are obtained based on the air volume command, including:

[0031] S21 controls the indoor fan to operate at a preset speed according to the air volume command.

[0032] S22: After the indoor fan has been running at a preset speed for a preset time, the current speed and power of the indoor fan are detected. In this way, the current speed and power of the indoor fan can be obtained simply and accurately.

[0033] Specifically, the preset speed can be pre-set, and the preset speed can be a speed within the speed range of the indoor fan. Upon receiving an airflow command, the preset speed is acquired, and the indoor fan is controlled to operate at the preset speed. After the indoor fan has been operating at the preset speed for a preset duration, the current speed and current power are acquired. The preset duration can be pre-set; for example, a preset duration of 2 minutes means the indoor fan will run at the preset speed for 2 minutes before acquiring the current speed and current power. The preset duration can be longer than the time required for the indoor fan speed to stabilize after startup. The specific value of the preset duration can be set according to actual conditions and is not specifically limited here. The current speed can be estimated based on the motor position of the indoor fan, and the current power can be estimated based on the real-time voltage and current of the indoor fan.

[0034] In some implementations, the preset speed is the minimum speed of the indoor fan. Since the speed is positively correlated with the air volume, the speed of the indoor fan can be gradually adjusted from the minimum speed, that is, the air volume output by the indoor fan can be gradually adjusted from the lowest air volume, so as to obtain an air volume that matches the air volume command.

[0035] In some implementations, the first rotational speed is calculated using a preset relationship between rotational speed and power, the current power, the target power, and the current rotational speed, with the target power determined by the airflow command, given that the indoor fan is outputting a set airflow. In this way, the first rotational speed corresponding to different set airflows under the current static pressure can be quickly and accurately obtained through the preset relationship between rotational speed and power, resulting in multiple first rotational speeds. Since the obtained first rotational speed is related to the current static pressure and the airflow corresponding to the airflow command, it better reflects the current actual situation and helps ensure the accuracy of the second rotational speed obtained based on the first rotational speed.

[0036] In some implementations, the preset relationship between rotational speed and power includes a first preset relationship and a second preset relationship. The first preset relationship includes the correspondence between current power and current rotational speed, and the second preset relationship includes the correspondence between target power and first rotational speed. The first rotational speed is calculated using the first and second preset relationships when the indoor fan outputs a preset air volume and the current power is equal to the target power. Thus, based on different preset relationships between rotational speed and power, multiple first rotational speeds can be calculated based on the target power when the target power is equal to the current power.

[0037] In some implementations, the first preset relationship is the cubic relationship between power and speed. This not only accurately reflects the relationship between speed and power, but also reduces the amount of calculation required for the first speed.

[0038] Specifically, based on the analysis of indoor fan power and indoor fan speed, the preset relationship between speed and power can be expressed by a cubic polynomial:

[0039] p=ka×n+kb×n^2+kc×n^3 (1)

[0040] Where p is the indoor fan power, n is the indoor fan speed, and ka, kb, and kc are constants, which can be obtained by curve fitting based on experimental data.

[0041] Alternatively, the power of the indoor fan can be approximated as the cube of the indoor fan speed:

[0042] p=k4×n^3 (2)

[0043] Where p is the indoor fan power, n is the indoor fan speed, and k4 is a constant.

[0044] In practical applications, since formula (2) corresponds to a constant, it can be calculated based on a set of power and speed. Therefore, the relationship between speed and power corresponding to formula (2) can be used as the first preset relationship, that is, the correspondence between current power and current speed. After obtaining the current speed and current power, the constant k4 can be calculated from the first preset relationship. Since formula (1) contains multiple constants, the relationship between speed and power corresponding to formula (1) can be used as the second preset relationship, that is, the correspondence between target power and first speed. The constant can be obtained in advance through experimental testing. It can be seen from formula (2) that the first preset relationship omits the quadratic and linear terms of indoor fan speed. Therefore, it can also be understood that the first preset relationship is a simplification of the second preset relationship.

[0045] When the current power is equal to the target power, that is, when k4×n^3=ka×n+kb×n^2+kc×n^3(2-1), since k4 can be determined by the current power and the current speed, and ka, kb and kc are constants, the first speed can be calculated according to formula 2-1.

[0046] The preset air volume can be set in advance, for example, the preset air volume can be Q1, Q2, ..., Q... N Where Q1 < Q2 < ... < Q N N is a positive integer, representing N preset airflow rates Q1, Q2, ..., Q... N The preset airflow is pre-stored in the air conditioner, and N preset airflow values ​​are obtained by querying them when the air conditioner is running. Furthermore, different preset airflow values ​​correspond to different second preset relationships, that is, they have different constants ka, kb, and kc. Therefore, multiple first speeds can be calculated based on different preset airflow values.

[0047] In some implementations, the target power is determined by a preset relationship between power and airflow and the airflow corresponding to the airflow command. The preset relationship between power and airflow is a pre-defined correspondence between power and airflow. Thus, the target power can be obtained quickly and accurately based on the airflow corresponding to the airflow command and the preset relationship between power and airflow.

[0048] In some implementations, in the preset relationship between power and air volume, the power is obtained based on the first power and first weight corresponding to the lower limit of the air volume range, and the second power and second weight corresponding to the upper limit of the air volume range. The air volume range is determined by the air volume corresponding to the air volume command.

[0049] Specifically, airflow ranges can be preset based on a pre-defined airflow rate. Using the previous example, the airflow range could be [Q1, Q2], [Q2, Q3], ..., [Q...]. n-1 Q n During air conditioner operation, after receiving the airflow command from the indoor fan, the airflow range in which the command falls is determined based on the corresponding airflow and the boundary values ​​of a pre-set airflow range. Using the example above, let's assume the airflow corresponding to the command is Q. * If Q1≤Q * If Q2 ≤ Q2, then the airflow command is located in the first airflow interval [Q1, Q2]; if Q2 ≤ ... * If the value is ≤Q3, then the airflow range in which the airflow command is located can be determined as the second airflow range (Q2,Q3). Then, based on the first power and first weight corresponding to the lower limit of the airflow range, and the second power and second weight corresponding to the upper limit of the airflow range, the preset relationship between power and airflow is obtained.

[0050] As an example, the second weight is determined based on the ratio of the difference between the airflow corresponding to the airflow command and the lower limit of the airflow range to the ratio of the difference between the upper limit of the airflow range and the lower limit of the airflow range, that is:

[0051] h=(Q * -Q1) / (Q2-Q1) (3)

[0052] Where h is the second weight, Q * Here, Q1 represents the airflow corresponding to the airflow command, and Q2 represents the lower limit of the airflow range. In the example above, when the first airflow range is [Q1, Q2], the lower limit Q1 is Q1, and the upper limit Q2 is Q2; when the second airflow range is (Q2, Q3], the lower limit Q1 is Q2, and the upper limit Q2 is Q3. The sum of the first weight and the second weight is 1.

[0053] ​After determining the first and second weights, the first power and first weight corresponding to the lower limit of the airflow range are summed with the second power and second weight corresponding to the upper limit of the airflow range. This yields a preset relationship between power and airflow. This preset relationship is essentially the relationship between power and rotational speed, but it is related to airflow; therefore, it is also called the preset relationship between power and airflow.

[0054] p * = (1-h)×p1+h×p2 (4)

[0055] Where, p * Let p1 be the target power, p2 be the second power, h be the second weight, and (1-h) be the first weight.

[0056] In some implementations, the first power and the second power are obtained based on a preset relationship between power and rotational speed and the current rotational speed. In this way, the first power and the second power can be obtained quickly.

[0057] It should be noted that each airflow setting corresponds to a preset power-speed relationship, meaning that the lower and upper limits of each airflow range correspond to a preset power-speed relationship. For example, in the previous example, the lower limit of the first airflow range [Q1, Q2] is Q1 and the upper limit is Q2, so the lower limit Q1 and the upper limit Q2 each correspond to a preset power-speed relationship; the lower limit of the second airflow range (Q2, Q3) is Q2 and the upper limit is Q3, so the lower limit Q2 and the upper limit Q3 each correspond to a preset power-speed relationship. The upper limit Q1 of the first airflow range [Q1, Q2] and the lower limit Q2 of the second airflow range (Q2, Q3) correspond to the same preset power-speed relationship.

[0058] After obtaining the current speed, the first power can be calculated based on the preset relationship between the power and speed corresponding to the current speed and the lower limit value, and the second power can be obtained based on the preset relationship between the power and speed corresponding to the current speed and the upper limit value.

[0059] In some implementations, the preset relationship between power and speed is related to a constant array and a speed array. The constant array is pre-stored in the air conditioner and includes at least one constant, with one constant array corresponding to each airflow rate. This allows for the rapid acquisition of the preset relationship between power and speed without consuming computational resources.

[0060] Specifically, the preset relationship between power and speed corresponding to each air volume can be obtained in advance through experimental testing. Taking the above example, the air volume can be set to Q1 first, and the data of indoor fan power p changing with indoor fan speed n can be tested. Then, curve fitting can be performed according to the above formula (1) to obtain the values ​​of ka, kb, and kc when the air volume is Q1. Using the same method, the values ​​of ka, kb, and kc when the air volume is Q2, Q3, etc. can be obtained respectively. The values ​​of ka, kb, and kc can form a constant array and be stored in advance. That is, in this embodiment, the constant array includes three constants. Thus, the preset relationship between power and speed corresponding to each air volume can be obtained. It is understood that in other embodiments, the constant array may also include one constant, two constants, or more than three constants, which is not specifically limited here.

[0061] In practical applications, each air volume (i.e., the set air volume) and the constants in the corresponding preset relationship between power and speed are stored as constant arrays in the air conditioner. So that during the operation of the air conditioner, after determining the air volume range in which the air volume command is located, the corresponding constant array can be directly called based on the lower and upper limits of the air volume range. Based on the constants in the constant array, the corresponding preset relationship between power and speed can be obtained, thereby effectively saving the computing resources and calculation time of the system processor.

[0062] In some implementations, the second rotational speed is obtained by using a lookup table or interpolation method based on the airflow corresponding to the airflow command and multiple first rotational speeds. This allows for the rapid acquisition of the second rotational speed while reducing the consumption of computational resources. Furthermore, since the multiple first rotational speeds obtained have high accuracy, the accuracy of the second rotational speed is guaranteed.

[0063] Specifically, assuming the air volume corresponding to the air volume command is between Q1 and Q2, then the first rotation speed can be determined as n1 and n2. Based on the first rotation speed as n1 and n2, and the air volume as Q1 and Q2, the second rotation speed can be calculated using the following formula (5):

[0064] (Q2-Q1) / (n2-n1)=(Q-Q1) / (n'-n1) (5)

[0065] Where n' is the second rotational speed.

[0066] After obtaining the second rotational speed, the indoor fan can be controlled according to the second rotational speed.

[0067] like Figure 3 As shown, the indoor fan includes seven preset air volumes Q1, Q2, ..., Q7, where Q1 < Q2 < ... < Q7. Each preset air volume corresponds to a second preset relationship P* = k1. x ×n+k2 x ×n^2+k3x ×n^3, that is, the curves corresponding to Q1, Q2, ..., Q7; at the same time, based on the current power and the current speed, the constant k4 can be calculated by the above formula (2), thus obtaining the first preset relationship p0=k4×n^3. By making p0=P* and performing speed calculation, seven first speeds can be obtained, namely n1, n2, ..., n7. Then, based on the seven first speeds and the air volume corresponding to the air volume command, the second speed is calculated by the above formula (5), and then the indoor fan is controlled according to the second speed. Through test data, it can be seen that in this embodiment, the air volume control in the current environment can be achieved by one calculation, and since there is no speed adjustment process, the possibility of speed fluctuation will not be increased.

[0068] In some implementations, the current power equals the target power when the airflow output by the indoor fan matches the airflow command. Thus, when the current power equals the target power, the airflow output by the indoor fan can be considered to match the airflow command. It should be noted that "equal to target power" can mean completely equal or that the difference between the two is within a set range.

[0069] In summary, the constant air volume control method for a ducted air conditioner according to the embodiments of the present invention can obtain a second rotation speed based on the air volume corresponding to multiple first rotation speeds and air volume commands, and then control the indoor fan to obtain an air volume that matches the air volume command. Since the first rotation speed is related to the current static pressure, it can output the required air volume according to the air conditioner's installation or usage environment, thereby achieving air volume control under the current environment.

[0070] Corresponding to the constant air volume control method for ducted air conditioners provided in the above embodiments, the present invention also provides a ducted air conditioner, including a memory, a processor, and a constant air volume control program for the ducted air conditioner stored in the memory and executable on the processor. When the processor executes the constant air volume control program for the ducted air conditioner, it implements the constant air volume control method for the ducted air conditioner described above.

[0071] According to the duct air conditioner of the present invention, the constant air volume control method of the duct air conditioner described above can obtain a second rotation speed based on the air volume corresponding to multiple first rotation speeds and air volume commands, and then control the indoor fan to obtain an air volume that matches the air volume command. Since the first rotation speed is related to the current static pressure, it can output the required air volume according to the air conditioner installation or use environment, and realize air volume control in the current environment.

[0072] Corresponding to the constant air volume control method for ducted air conditioners provided in the above embodiments, embodiments of the present invention also provide a computer-readable storage medium storing a constant air volume control program for a ducted air conditioner. When the constant air volume control program for the ducted air conditioner is executed by a processor, it implements the constant air volume control method for ducted air conditioners described in the above embodiments.

[0073] According to the computer-readable storage medium of the present invention, the constant air volume control method of the duct air conditioner described above can obtain a second rotation speed based on the air volume corresponding to multiple first rotation speeds and air volume commands, and then control the indoor fan to obtain an air volume that matches the air volume command. Since the first rotation speed is related to the current static pressure, it can output the required air volume according to the air conditioner installation or usage environment, and realize air volume control under the current environment.

[0074] Corresponding to the constant air volume control method for ducted air conditioners provided in the above embodiments, embodiments of the present invention also provide a constant air volume control device for ducted air conditioners.

[0075] Figure 4 This is a schematic diagram of the structure of a constant air volume control device for a ducted air conditioner according to an embodiment of the present invention. Figure 4 As shown, the constant air volume control device 200 of the ducted air conditioner includes: an acquisition unit 210 and a control unit 220, wherein:

[0076] The acquisition unit 210 is used to acquire the current speed and current power of the indoor fan according to the air volume command;

[0077] The control unit 220 is used to acquire multiple first speeds, acquire a second speed according to the multiple first speeds and the air volume corresponding to the air volume command, and use the second speed to control the operation of the indoor fan so that the air volume output by the indoor fan matches the air volume command. The multiple first speeds are the speeds corresponding to the indoor fan outputting multiple preset air volumes under the current static pressure and are related to the current speed and the current power.

[0078] Specifically, in one embodiment, the acquisition unit 210 may include relevant sensors to detect the real-time voltage, current and current speed of the indoor fan, and use the real-time voltage and current of the indoor fan to calculate the current power.

[0079] In one embodiment, the acquisition unit 210 may also include a processor and a memory, with the processor executing a corresponding program stored in the memory to implement the function of the acquisition unit 210.

[0080] In one embodiment, the control unit 220 may include a processor and a memory, wherein the processor executes a corresponding program stored in the memory to implement the functions of the control unit 220.

[0081] It is understood that the processor of the acquisition unit 210 and the processor of the control unit 220 may be the same processor or different processors, and the memory of the acquisition unit 210 and the memory of the control unit 220 may be the same memory or different memory, without specific limitations here.

[0082] In some implementations, the acquisition unit 210 is used to control the indoor fan to operate at a preset speed according to the air volume command; after the indoor fan has been running at the preset speed for a preset time, the current speed and current power of the indoor fan are detected.

[0083] In some implementations, the preset speed is the minimum speed of the indoor fan.

[0084] In some implementations, the first rotational speed is calculated using a preset relationship between rotational speed and power, current power, target power, and current rotational speed, with the indoor fan outputting a set airflow. The target power is determined by the airflow command.

[0085] In some implementations, the preset relationship between rotation speed and power includes a first preset relationship and a second preset relationship. The first preset relationship includes the correspondence between current power and current rotation speed, and the second preset relationship includes the correspondence between target power and first rotation speed. The first rotation speed is calculated using the first preset relationship, the second preset relationship, and the target power when the indoor fan outputs a preset air volume and the current power is equal to the target power.

[0086] In some implementations, the first preset relationship is a cubic relationship between power and rotational speed.

[0087] In some implementations, the target power is determined by a preset relationship between power and air volume and the air volume corresponding to the air volume command, wherein the preset relationship between power and air volume is a pre-calibrated correspondence between power and air volume.

[0088] In some implementations, in the preset relationship between power and air volume, the power is obtained based on the first power and first weight corresponding to the lower limit of the air volume range, and the second power and second weight corresponding to the upper limit of the air volume range. The air volume range is determined by the air volume corresponding to the air volume command.

[0089] In some implementations, the first power and the second power are obtained based on a preset relationship between power and rotational speed and the current rotational speed.

[0090] In some implementations, in the preset relationship between power and speed, power is related to a constant array and speed. The constant array is pre-stored in the air conditioner and includes at least one constant, with one constant array corresponding to each air volume.

[0091] In some implementations, the second rotational speed is obtained by looking up a table or interpolation based on the air volume corresponding to the air volume command and multiple first rotational speeds.

[0092] In some implementations, the current power equals the target power when the air volume output by the indoor fan matches the air volume command.

[0093] It should be noted that for details regarding the undisclosed constant air volume control device of ducted air conditioners, please refer to the details disclosed in the constant air volume control method for ducted air conditioners; specific details will not be repeated here.

[0094] According to the constant air volume control device of the duct air conditioner of the present invention, a second rotation speed can be obtained based on the air volume corresponding to multiple first rotation speeds and air volume commands, and then the indoor fan can be controlled to obtain an air volume that matches the air volume command. Since the first rotation speed is related to the current static pressure, the required air volume can be output according to the air conditioner installation or use environment to achieve air volume control under the current environment.

[0095] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0096] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0097] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0098] Furthermore, the terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this invention can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this invention, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0099] In this invention, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific implementation.

[0100] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for controlling constant air volume in a ducted air conditioner, characterized in that, include: The current speed and power of the indoor fan are obtained based on the air volume command; Multiple first speeds are obtained, which are the speeds corresponding to the indoor fan outputting multiple preset air volumes under the current static pressure and are related to the current speed and the current power. The second rotation speed is obtained based on the plurality of first rotation speeds and the air volume corresponding to the air volume command; The second rotation speed is used to control the operation of the indoor fan so that the air volume output by the indoor fan matches the air volume command; The first rotational speed is calculated using a preset relationship between rotational speed and power, the current power, the target power, and the current rotational speed, when the indoor fan outputs a set air volume. The target power is determined by the air volume command. The preset relationship between rotational speed and power includes a first preset relationship and a second preset relationship. The first preset relationship includes the correspondence between the current power and the current rotational speed, and the second preset relationship includes the correspondence between the target power and the first rotational speed. The first rotational speed is calculated using the first preset relationship and the second preset relationship when the indoor fan outputs the preset air volume and the current power is equal to the target power.

2. The method according to claim 1, characterized in that, The step of obtaining the current speed and power of the indoor fan based on the air volume command includes: According to the air volume command, the indoor fan is controlled to operate at a preset speed; After the indoor fan has been running at the preset speed for a preset time, the current speed and current power of the indoor fan are detected.

3. The method according to claim 2, characterized in that, The preset speed is the minimum speed of the indoor fan.

4. The method according to claim 1, characterized in that, The first preset relationship is a cubic relationship between power and rotational speed.

5. The method according to claim 4, characterized in that, The target power is determined by the preset relationship between power and air volume and the air volume corresponding to the air volume command, wherein the preset relationship between power and air volume is a pre-calibrated correspondence between power and air volume.

6. The method according to claim 5, characterized in that, In the preset relationship between power and air volume, the power is obtained based on the first power and first weight corresponding to the lower limit of the air volume range, and the second power and second weight corresponding to the upper limit of the air volume range. The air volume range is determined by the air volume corresponding to the air volume command.

7. The method according to claim 6, characterized in that, The first power and the second power are obtained based on a preset relationship between power and rotational speed and the current rotational speed.

8. The method according to claim 7, characterized in that, In the preset relationship between power and speed, the power is related to a constant array and the speed. The constant array is pre-stored in the air conditioner and includes at least one constant, with one constant array corresponding to each air volume.

9. The method according to claim 1, characterized in that, The second rotational speed is obtained by using a lookup table method or interpolation method based on the air volume corresponding to the air volume command and the plurality of first rotational speeds.

10. The method according to claim 1, characterized in that, When the air volume output by the indoor fan matches the air volume command, the current power is equal to the target power.

11. A ducted air conditioner, characterized in that, The system includes a memory, a processor, and a constant air volume control program for a ducted air conditioner stored in the memory and executable on the processor. When the processor executes the constant air volume control program for the ducted air conditioner, it implements the constant air volume control method for the ducted air conditioner as described in any one of claims 1-10.

12. A computer-readable storage medium, characterized in that, It stores a constant air volume control program for a ducted air conditioner, which, when executed by a processor, implements the constant air volume control method for a ducted air conditioner as described in any one of claims 1-10.

13. A constant air volume control device for a ducted air conditioner, characterized in that, The method for controlling the constant air volume of a ducted air conditioner as described in any one of claims 1-10 includes: The acquisition unit is used to acquire the current speed and current power of the indoor fan according to the air volume command; The control unit is configured to acquire multiple first speeds, acquire a second speed according to the multiple first speeds and the air volume corresponding to the air volume command, and control the operation of the indoor fan using the second speed so that the air volume output by the indoor fan matches the air volume command. The multiple first speeds are the speeds corresponding to the indoor fan outputting multiple preset air volumes under the current static pressure and are related to the current speed and the current power.

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