Constant air volume control method and device of fan, air conditioning equipment and medium

Abstract

The invention discloses a constant air volume control method and device of a fan, air conditioning equipment and a medium. The method comprises the steps that the current rotating speed value of the fan and the current characteristic value of characteristic parameters are periodically obtained; the current target air volume and the current rotating speed value are input into a pre-established target curved surface model to obtain a target feature value of the feature parameters, the target curved surface model is a three-dimensional curved surface representing the relation between the rotating speed of the fan and the feature parameters in a target air volume interval, and the current target air volume belongs to the target air volume interval; and the rotating speed of the fan is adjusted according to the size relation between the target characteristic value and the current characteristic value. According to the invention, the technical problem of low constant air volume control precision of the fan in related technologies is solved.

Description

Technical Field

[0001] This invention belongs to the field of home appliance technology, and particularly relates to a constant air volume control method, device, air conditioning equipment and medium for a fan. Background Technology

[0002] For ducted air conditioning equipment, if a long exhaust duct is required for air intake, the increased static pressure due to the long duct will affect the actual air volume. At the same rotational speed, a short exhaust duct will produce a larger air volume at the outlet, while a long exhaust duct will produce a smaller air volume. However, the actual length of the exhaust duct installed by the user is entirely limited by the installation environment, resulting in poor consistency. Therefore, a constant air volume control mode is needed to achieve a constant air volume output at the outlet under different installation environments with varying exhaust duct lengths.

[0003] In related technologies, the constant air volume control mode establishes multiple preset air volume curves to control the fan speed in order to achieve constant air volume output. The remaining air volume values ​​located between the preset air volume curves need to be calculated by linear interpolation before speed control. The accuracy of constant air volume control for the fan is relatively low, and it is not suitable for application scenarios of stepless constant air volume adjustment. Summary of the Invention

[0004] This invention provides a constant air volume control method, device, air conditioning equipment, and medium for fans, in order to solve the technical problem of low accuracy in constant air volume control of fans in related technologies.

[0005] In a first aspect of the present invention, a constant airflow control method for a fan is provided, comprising: periodically acquiring the current rotational speed value and the current characteristic value of a characteristic parameter of the fan; inputting the current target airflow and the current rotational speed value into a pre-established target surface model to obtain the target characteristic value of the characteristic parameter, wherein the target surface model is a three-dimensional surface characterizing the relationship between the rotational speed of the fan and the characteristic parameter within a target airflow range, and the current target airflow belongs to the target airflow range; and adjusting the rotational speed of the fan according to the magnitude relationship between the target characteristic value and the current characteristic value.

[0006] In conjunction with the first aspect, in some embodiments, before inputting the current target air volume and the current rotation speed value into the pre-established target surface model, the method further includes: determining the target air volume interval where the current target air volume is located from the pre-divided M air volume intervals, wherein the M air volume intervals are divided into the constant air volume adjustment range of the fan, and M is an integer greater than 1; and obtaining the target surface model from the pre-established M surface models according to the target air volume interval, wherein the M surface models correspond one-to-one with the M air volume intervals.

[0007] In conjunction with the first aspect, in some embodiments, the target air volume range is the constant air volume adjustment range of the fan, and the target surface model is a continuous air volume range that characterizes the stepless adjustment of the target air volume.

[0008] In conjunction with the first aspect, in some embodiments, before obtaining the current rotational speed value of the fan and the current characteristic value of the characteristic parameter, the method further includes: obtaining an airflow setting instruction; and setting a current target airflow within the constant airflow adjustment range according to the airflow setting instruction, wherein the constant airflow adjustment range is a range for continuously adjusting the target airflow.

[0009] In conjunction with the first aspect, in some embodiments, the step of inputting the current target airflow and current rotational speed values ​​into a pre-established target surface model to obtain target feature values ​​of the feature parameters includes: before periodically acquiring the current rotational speed value of the fan and the current feature values ​​of the feature parameters, inputting the current target airflow into the target surface model to obtain a target curve model corresponding to the current target airflow, wherein the target curve model characterizes the relationship between the fan rotational speed and the feature parameters under the current target airflow; and after each acquisition of the current rotational speed value, inputting the current rotational speed value into the target curve model to obtain the target feature values.

[0010] In conjunction with the first aspect, in some embodiments, the step of inputting the current target airflow and current rotation speed value into a pre-established target surface model to obtain the target feature value of the feature parameter includes: after each acquisition of the current rotation speed value, inputting the current target airflow into the target surface model to obtain a target curve model corresponding to the current target airflow, wherein the target curve model characterizes the relationship between the fan rotation speed and the feature parameter under the current target airflow; and inputting the current rotation speed value into the target curve model to obtain the target feature value.

[0011] In conjunction with the first aspect, in some embodiments, each of the M surface models is pre-established based on three-dimensional mapping data within the airflow range corresponding to that surface model; wherein, the three-dimensional mapping data within each airflow range includes data mapping between airflow, fan speed and characteristic parameters within that airflow range.

[0012] In conjunction with the first aspect, in some embodiments, each of the M surface models is pre-established through the following steps: establishing N curve models corresponding to N candidate airflow values, each curve model representing the relationship between the fan speed and characteristic parameters under that candidate airflow value, where N is an integer greater than 1; obtaining full three-dimensional mapping data based on the N curve models, where each mapping data in the full three-dimensional mapping data is a mapping of fan speed, airflow, and characteristic parameters; dividing the full three-dimensional mapping data into M parts according to the M airflow intervals, and generating the M surface models one-to-one according to the M parts of the three-dimensional mapping data.

[0013] In conjunction with the first aspect, in some embodiments, the target surface model is established based on pre-determined full three-dimensional mapping data, which includes data mapping between air volume, fan speed and the characteristic parameters within the constant air volume adjustment range.

[0014] In conjunction with the first aspect, in some embodiments, the target surface model is established in advance through the following steps: establishing N curve models corresponding to N candidate airflow values, each curve model representing the relationship between the fan speed and characteristic parameters under that candidate airflow value, where N is an integer greater than 1; obtaining full three-dimensional mapping data based on the N curve models, where each mapping data in the full three-dimensional mapping data is a mapping of fan speed, airflow, and characteristic parameters; and performing surface modeling based on the full three-dimensional mapping data to obtain the target surface model.

[0015] In conjunction with the first aspect, in some implementations, establishing N curve models corresponding to N candidate airflow values ​​includes: for each candidate airflow value among the N candidate airflow values, obtaining multiple rotational speed values ​​and multiple characteristic values ​​of the characteristic parameters under that candidate airflow value, and establishing a curve model corresponding to that candidate airflow value based on the multiple rotational speed values ​​and the multiple characteristic values ​​of the characteristic parameters under that candidate airflow value.

[0016] In conjunction with the first aspect, in some embodiments, the fan is a centrifugal fan, and adjusting the fan speed according to the relationship between the target feature value and the current feature value includes: if the current feature value is greater than the target feature value, reducing the fan speed; if the current feature value is less than the target feature value, increasing the fan speed.

[0017] In a second aspect of the invention, a constant airflow control device for a fan is provided, comprising: a parameter value acquisition unit for periodically acquiring the current rotational speed value and the current characteristic value of a characteristic parameter of the fan; a parameter processing unit for inputting the current target airflow and the current rotational speed value into a pre-established target surface model to obtain the target characteristic value of the characteristic parameter, wherein the target surface model is a three-dimensional surface characterizing the relationship between the rotational speed of the fan and the characteristic parameter within a target airflow range, and the current target airflow belongs to the target airflow range; and a rotational speed adjustment unit for adjusting the rotational speed of the fan according to the magnitude relationship between the target characteristic value and the current characteristic value.

[0018] In a third aspect of the invention, an air conditioning device is provided, having a fan, and further comprising: a processor; and a memory for storing processor-executable instructions, wherein the processor is configured to execute the instructions to implement the constant airflow control method for the fan according to any embodiment of the first aspect.

[0019] In a fourth aspect of the invention, a computer-readable storage medium is provided having a computer program stored thereon, characterized in that, when executed by a processor, the computer program implements the constant air volume control method for a fan as described in any embodiment of the first aspect.

[0020] The one or more technical solutions provided in the embodiments of the present invention achieve at least the following technical effects or advantages:

[0021] The system periodically acquires the current speed and characteristic values ​​of the fan's features. The current target airflow and speed are input into the target surface model to obtain the target characteristic values ​​of the features. The fan speed is then adjusted based on the relationship between the target and current characteristic values. Since the target surface model is a three-dimensional surface representing the relationship between the target airflow, fan speed, and feature parameters within the target airflow range, and the current target airflow falls within this range, inputting the current target airflow and speed directly and accurately yields the target characteristic values ​​for adjusting the fan speed from the pre-established target surface model. This reduces interpolation and other calculation processes, avoiding the reduction in accuracy caused by interpolation, thus improving the accuracy of the target characteristic values ​​and consequently enhancing the precision of the stepless constant airflow control. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A flowchart of a constant air volume control method for a fan provided in some embodiments of the present invention is shown;

[0024] Figure 2 A schematic diagram of N curve models corresponding to N candidate air volume values ​​is shown in some embodiments of the present invention;

[0025] Figure 3 This diagram illustrates the splicing of M surface models in some embodiments of the present invention.

[0026] Figure 4 The diagram shows a structural schematic of a constant air volume control device provided in some embodiments of the present invention;

[0027] Figure 5 A schematic diagram of the structure of an air conditioning device provided in some embodiments of the present invention is shown. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0030] This invention provides a constant airflow control method for a fan, which can be applied to air conditioning equipment with a fan to achieve a constant airflow output from the air outlet of the air conditioning equipment, such as an air purifier, air conditioner, heater, or fresh air system. Figure 1 As shown, the constant air volume control method for a fan provided by the present invention includes the following steps S101 to S103.

[0031] S101. Periodically acquire the current speed value and the current characteristic value of the characteristic parameters of the fan.

[0032] In some implementations, the current speed of the fan and the current characteristic value of the characteristic parameter are periodically acquired according to a preset control cycle. Specifically, the current speed of the fan and the current characteristic value of the characteristic parameter are acquired once every time interval T1, where T1 is the preset control cycle. Each time the current speed of the fan and the current characteristic value of the characteristic parameter are acquired, the fan speed can be sampled multiple times, and the average of the sampled speed values ​​can be calculated to obtain the current speed value. Similarly, the characteristic parameter can be sampled multiple times, and the average of the sampled characteristic values ​​can be calculated to obtain the current characteristic value.

[0033] In some implementations, before step S101, the method further includes: obtaining an air volume setting instruction; setting the current target air volume within the constant air volume adjustment range of the fan according to the air volume setting instruction, wherein the constant air volume adjustment range is the range of continuously adjusting the target air volume.

[0034] In some implementations, the airflow setting command can originate from a host computer. The airflow setting command generated by the user's airflow setting operation on the host computer is sent to the MCU of the air conditioning equipment where the fan is located. The host computer can be a remote control, wired controller, or mobile terminal used to control the air conditioning equipment, etc.

[0035] S102. Input the current target air volume and current speed value into the pre-established target surface model to obtain the target characteristic value of the characteristic parameter. The target surface model is a three-dimensional surface that represents the relationship between the fan speed and characteristic parameters within the target air volume range. The current target air volume belongs to the target air volume range.

[0036] In some implementations, the target air volume is infinitely adjustable, and the constant air volume adjustment range of the fan is a continuous air volume range that characterizes the infinitely adjustable target air volume. For example, the constant air volume adjustment range of the fan is a continuous air volume range of 100~

[0037] 1600m 3 / h, the target air volume can be adjusted from 100 to 1600 m³ / h. 3 Any airflow value within the range of / h. M airflow intervals are formed by dividing the continuous airflow range; each resulting airflow interval is a continuous airflow interval. For example, the continuous airflow range is 100–1600 m³ / h. 3 / h can divide this continuous airflow range into three continuous airflow intervals: [100, 600].

[0038] (600,1100]、(1100,1600).

[0039] In some implementations, multiple surface models, including a target surface model, are pre-established. Before inputting the current target air volume and current rotation speed values ​​into the pre-established target surface model, the method further includes: determining the target air volume interval from the pre-divided M air volume intervals, where the M air volume intervals are the constant air volume adjustment range of the fan, and M is an integer greater than 1; and obtaining the target surface model from the pre-established M surface models based on the target air volume interval, with each of the M surface models corresponding to one of the M air volume intervals.

[0040] It should be noted that the M surface models are established for the same air duct system; the number of M surface models required for different air duct systems will vary accordingly. For the same fixed air duct system, data for establishing the M surface models can be obtained by testing only on a prototype with the same air duct system, and the M surface models can be pre-established. The pre-established M surface models can be written into the MCU of any air conditioning device with the same air duct system, without needing to re-establish the M surface models for each air conditioning device.

[0041] It should be noted that the number of pre-established surface models is related to the size of the continuous adjustment range of the target air volume. The larger the continuous adjustment range of the target air volume, the more pre-established surface models there are. The relationship between the target air volume, the fan speed and characteristic parameters represented by each surface model within the air volume range will be more accurate. This avoids the situation where the air volume covered by the same surface model is too wide, which would reduce the accuracy of calculating the target characteristic value by always using that surface model.

[0042] In some implementations, the target airflow interval is determined from M airflow intervals, and the surface model corresponding to the target airflow interval is obtained from M surface models corresponding to the M airflow intervals, serving as the target surface model. It can be understood that the surface model corresponding to each airflow interval is a three-dimensional surface characterizing the relationship between the target airflow, the fan speed, and characteristic parameters within that airflow interval. M can be 2, 3, 4, or 5, or even larger. In some implementations, M = 3, meaning that three surface models corresponding to high, medium, and low airflow intervals can be pre-established.

[0043] In some implementations, for each of the M surface models, a three-dimensional mapping data is pre-established based on the airflow interval corresponding to that surface model. This three-dimensional mapping data for each airflow interval includes mapping data between airflow, fan speed, and characteristic parameters within that airflow interval. It can be understood that the three-dimensional mapping data for each airflow interval represents the mapping data for multiple airflow values ​​within that airflow interval. Each airflow value's mapping data includes multiple data points, and each mapping data point represents the mapping between that airflow value and a fan speed value and a characteristic value of the characteristic parameter. The various airflow values ​​within the airflow interval are uniformly distributed within the constant airflow adjustment range according to a preset interval, for example, a preset interval of 200m. 3 / h, the air volume range is 1000~2000m³ / h. 3 / h, the air volume values ​​within this air volume range are successively 1000m³ / h. 3 / h, 1200m 3 / h, 1400m 3 / h, 1600m 3 / h……2000m 3 / h.

[0044] In some implementations, the three-dimensional mapping data within each airflow interval has a uniformly distributed airflow value, and the airflow values ​​between two adjacent airflow intervals are also uniformly distributed.

[0045] In some implementations, if the continuous adjustment range of the target air volume is divided into three air volume intervals—high, medium, and low—the three-dimensional mapping data between these intervals can be found in Tables 1, 2, and 3 below:

[0046] Table 1. Three-dimensional mapping data within the low airflow range

[0047]

[0048] Table 2. Three-dimensional mapping data within the medium wind volume range

[0049]

[0050] Table 3. Three-dimensional mapping data within the high airflow range

[0051]

[0052] The model functions for the three surface models corresponding to the high, medium, and low airflow ranges are m_low = F_low(n,Q), m_mid = F_mid(n,Q), and m_low = F_low(n,Q). The form of the three surface models after being stitched together can be found by referring to... Figure 3 As shown. It should be noted that, Figure 3This is only for displaying the model styles of M curved surfaces. The coordinate values ​​of the XYZ axes are subject to actual measurement results. Figure 3 The coordinate values ​​of the XYZ axes are not limited. The M surface models can be three-dimensional surfaces built using MATLAB, with the characteristic parameters as the Z-axis, the target air volume as the x-axis, and the fan speed as the y-axis.

[0053] In some implementations, the model function of each surface model can be a cubic equation in two variables relating the characteristic parameters and the fan speed within the corresponding airflow range, and the surface model is the trajectory of the solution to the cubic equation in two variables.

[0054] The model functions of the M pre-established surface models are written into the controller of the air conditioning equipment, such as the memory of the MCU chip, to complete the algorithm pre-made for the constant air volume control mode, so that the air conditioning equipment can call it when it runs.

[0055] In some implementations, each of the M surface models is pre-established through the following steps: establishing N curve models corresponding to N candidate airflow values, each curve model representing the relationship between the fan speed and characteristic parameters under that candidate airflow value, where N is an integer greater than 1; obtaining full three-dimensional mapping data based on the N curve models, where each mapping data in the full three-dimensional mapping data is a mapping of fan speed, airflow, and characteristic parameters; dividing the full three-dimensional mapping data into M parts according to the M airflow intervals, and generating M surface models corresponding to the M parts of the three-dimensional mapping data.

[0056] like Figure 2 As shown, it can be used for 800m 3 / h, 1000m 3 / h, 1200m 3 / h, 1400m 3 / h, 1600m 3 / h, 1800m 3 / h、2000m 3 / h、2200m 3 / h, 2400m 3 For each of the candidate air volume values, a corresponding curve model is established. Each curve model is a continuous curve representing the relationship between the fan speed and characteristic parameters under that candidate air volume value.

[0057] In other implementations, each of the M surface models is pre-established through the following steps: after establishing N curve models corresponding to N candidate airflow values, for each airflow interval, three-dimensional mapping data within that airflow interval is obtained based on the K curve models corresponding to the K candidate airflow values ​​belonging to that airflow interval. Each mapping data is a mapping of fan speed, airflow, and characteristic value. The surface model corresponding to that airflow interval is generated based on the three-dimensional mapping data within that airflow interval, thereby reducing the process of dividing the three-dimensional mapping data.

[0058] The above one or more implementation methods are based on pre-established M surface models corresponding to M air volume intervals. The M air volume intervals are divided for the constant air volume adjustment range of the fan, so that the M surface models together cover the entire constant air volume adjustment range of the fan. In constant air volume adjustment scenarios with a wide constant air volume adjustment range and / or a wide static pressure range, conflicts can be avoided by using the same surface model in high air volume and high static pressure areas and low air volume and high static pressure areas. This ensures that no matter what the current target air volume is, a suitable surface model can be matched from the M surface models to accurately calculate the target feature value. This improves the accuracy of calculating the target feature value in scenarios with a wide constant air volume adjustment range and / or a wide static pressure range, thereby improving the accuracy of constant air volume control in scenarios with a wide constant air volume adjustment range and / or a wide static pressure range.

[0059] In other implementations, the pre-established surface model includes only one target surface model. That is, the target airflow range is the constant airflow adjustment range of the fan, and the target surface model is pre-established for this constant airflow adjustment range. It should be noted that only one target surface model needs to be established for the same duct system; different duct systems require different target surface models. For the same fixed duct system, data for establishing the target surface model is obtained only on a prototype with the same duct system, and the target surface model is pre-established. The pre-established target surface model can be written into the MCU of any air conditioning device with the same duct system, eliminating the need to re-establish the target surface model for each air conditioning device.

[0060] It should be noted that the structure of the motor, fan blades, and volute of different models of air conditioning equipment determines the differences in the air duct system of the air conditioning equipment.

[0061] Understandably, if the pre-established surface model is only the target surface model, then the target surface model is established based on the pre-measured full-volume 3D mapping data. This full-volume 3D mapping data includes the mapping data between airflow, fan speed, and characteristic parameters within the constant airflow adjustment range. Specifically, the full-volume 3D mapping data is the mapping data for multiple airflow values ​​within the constant airflow adjustment range. Each airflow value's mapping data includes multiple lines, and each line represents the mapping between that airflow value and a fan speed value and a characteristic parameter value. The airflow values ​​are uniformly distributed within the constant airflow adjustment range according to a preset interval. For example, if the preset interval is 100 m³ / h, the airflow values ​​in the full-volume 3D mapping data would be 100 m³ / h, 200 m³ / h, 300 m³ / h, 400 m³ / h, 500 m³ / h, and so on.

[0062] In some implementations, the full three-dimensional mapping data for the constant air volume adjustment range can be referenced in Table 4 below:

[0063] Table 4.

[0064]

[0065] Surface modeling is performed based on the full 3D mapping data. The model function of the target surface model is m = F(n, Q). It should be noted that the style of the target surface model is similar to the style of the M surface models after being stitched together. (See also: [reference needed]) Figure 3 As shown.

[0066] In some implementations, the model function of the target surface model can be a cubic equation in two variables that characterizes the relationship between the target air volume, characteristic parameters, and fan speed within the constant air volume adjustment range. The target surface model is the trajectory of the solution to the cubic equation. The pre-established model function of the target surface model is written into the controller of the air conditioning equipment, such as the memory of an MCU chip, to complete the algorithm pre-configuration of the constant air volume control mode for use by the air conditioning equipment during operation.

[0067] In some implementations, if the pre-established surface model is only the target surface model, the pre-established target surface model is established in advance through the following steps: establishing N curve models corresponding to N discrete candidate air volume values, each curve model representing the relationship between the fan speed and characteristic parameters under that candidate air volume value, where N is an integer greater than 1; obtaining full three-dimensional mapping data based on the N curve models, where each mapping data in the full three-dimensional mapping data is a mapping of fan speed, air volume, and characteristic parameters; and performing surface modeling based on the full three-dimensional mapping data to obtain the target surface model.

[0068] The above one or more implementation methods rely on establishing only one surface model in advance to cover the entire constant air volume adjustment range of the fan. In constant air volume control scenarios with narrow constant air volume adjustment range and static pressure range, the target characteristic value can be accurately calculated through the target surface model for any air volume value within the constant air volume adjustment range. This improves the accuracy of constant air volume control in scenarios with narrow constant air volume adjustment range and static pressure range.

[0069] In some implementations, the step of establishing N curve models corresponding to N candidate air volume values ​​during the process of pre-establishing one or more surface models may include: for each of the discrete N candidate air volume values, obtaining multiple speed values ​​of the fan speed and multiple characteristic values ​​of the characteristic parameters under that candidate air volume value, and establishing a curve model of that candidate air volume value based on the multiple speed values ​​of the fan speed and the multiple characteristic values ​​of the characteristic parameters under that candidate air volume value.

[0070] It is understandable that, for each candidate air volume value, the multiple speed values ​​of the fan speed and the multiple characteristic values ​​of the characteristic parameters obtained under that candidate air volume value are obtained by adjusting the static pressure in the air duct and the fan speed of the air conditioning prototype in a laboratory environment.

[0071] Understandably, in a laboratory environment, for each candidate airflow value, the static pressure within the duct and the fan speed of the air conditioning prototype are adjusted, and multiple speed values ​​and characteristic values ​​are measured for that candidate airflow value. Specifically, the static pressure within the air conditioning prototype's duct is sequentially adjusted to multiple different static pressure values ​​across the entire air pressure range. These different static pressure values ​​can be evenly spaced; for example, the static pressure within the duct is sequentially increased from 0 Pa to 20 Pa, 40 Pa, 60 Pa, 80 Pa, and so on, until the maximum static pressure value. For each adjusted static pressure value, the fan speed of the air conditioning prototype is then adjusted to ensure that the actual airflow at the air outlet is constant at that candidate airflow value. The characteristic parameter values ​​and fan speed values ​​are then collected. It should be noted that when the static pressure within the duct is at a certain value, only one speed point can ensure that the airflow at the air outlet is at that candidate airflow value. This process is repeated sequentially to obtain multiple speed values ​​and multiple characteristic values ​​corresponding one-to-one with various static pressure values ​​for each candidate airflow value. Other candidate airflow values ​​and multiple speed values ​​and characteristic values ​​can also be obtained by testing in the above manner. Based on this, the curve model for each candidate airflow value can be obtained by curve fitting of each speed value and each characteristic value measured within the entire air pressure range (0 Pa to maximum static pressure) under that candidate airflow value.

[0072] In some implementations, the characteristic parameters can be any of the following parameters of the fan: total power, total negative bus current, torque, magnitude of the sum of dq-axis current vectors, actual q-axis current (when id=0 control), square of the magnitude of the sum of dq-axis current vectors, square of the magnitude of the sum of dq-axis voltage vectors, magnitude of the sum of dq-axis voltage vectors, etc.

[0073] The power P of the wind turbine can be calculated using any of the following methods: P = U u *I u +U v *I v +U w *I w or Among them, U u U v U w I is the three-phase voltage of the fan. u I v I w U is the three-phase current of the fan. d U q I represents the d-axis and q-axis voltages. d I q These are the d-axis and q-axis voltages.

[0074] The magnitude I of the dq-axis current vector sum s It can be calculated using the following formula:

[0075]

[0076] The magnitude V of the dq-axis voltage vector sum s It can be calculated using the following formula:

[0077]

[0078] S103. Adjust the fan speed according to the relationship between the target characteristic value and the current characteristic value.

[0079] In some implementations, before periodically acquiring the current fan speed and the current characteristic values ​​of the characteristic parameters (i.e., before step S101), in response to the airflow setting command, the set current target airflow is input into a pre-established target surface model to obtain a target curve model corresponding to the current target airflow. That is, the current target airflow is substituted into the model function of the target surface model to obtain the target curve model corresponding to the current target airflow. The target curve model characterizes the relationship between the fan speed and the characteristic parameters under the current target airflow. After obtaining the target curve model, the current fan speed and the current characteristic values ​​of the characteristic parameters are periodically acquired according to a preset control cycle. That is, the current fan speed and the current characteristic values ​​of the characteristic parameters are acquired once every T1 time interval. After each acquisition of the current fan speed and the current characteristic values ​​of the characteristic parameters, the currently acquired current speed and current characteristic values ​​of the characteristic parameters are input into the target curve model, and the target characteristic values ​​of the characteristic parameters are output through the target curve model.

[0080] In other implementations, after each acquisition of the current rotational speed value, the current target air volume can be input into a pre-established target surface model to obtain a target curve model corresponding to the current target air volume. The target curve model represents the relationship between the fan rotational speed and characteristic parameters under the current target air volume. The current rotational speed value acquired in the current acquisition can be input into the target curve model to obtain the target characteristic value of the characteristic parameter.

[0081] Understandably, users can set any air volume value within the constant air volume adjustment range as the current target air volume, and obtain the target curve model corresponding to the current target air volume from the pre-established target surface model, thereby achieving stepless adjustment of the target air volume.

[0082] In step S103, the actual adjustment rule for adjusting the fan speed based on the relationship between the target characteristic value and the current characteristic value varies depending on the fan structure. If the fan is a centrifugal fan, adjusting the fan speed based on the relationship between the target characteristic value and the current characteristic value includes: if the current characteristic value is greater than the target characteristic value, decreasing the fan speed; if the current characteristic value is less than the target characteristic value, increasing the fan speed. If the fan is an axial flow fan, adjusting the fan speed based on the relationship between the target characteristic value and the current characteristic value includes: if the current characteristic value is greater than the target characteristic value, increasing the fan speed; if the current characteristic value is less than the target characteristic value, decreasing the fan speed.

[0083] In some implementations, the fan speed can be closed-loop regulated based on the relationship between the target characteristic value and the current characteristic value. That is, the deviation of the current characteristic value from the target characteristic value is determined, and a PI (proportional-integral) controller performs PI calculations on the deviation to obtain the current vector and amplitude. The current vector and amplitude refer to the vector amplitudes of the d-axis current setpoint id* and the q-axis current setpoint iq*, respectively. Next, the actual characteristic value of the characteristic parameter is adjusted according to the current vector and amplitude so that after at least one adjustment, the current characteristic value of the characteristic parameter is equal to or approximately equal to the target characteristic value. By adjusting the output capacity of the fan, closed-loop regulation of the fan speed is achieved, thereby realizing constant air volume control of the fan.

[0084] For example, the current vector and magnitude are processed by the MTPA (maximum torque per ampere) algorithm and converted into d-axis current setpoints and q-axis current setpoints. The d-axis and q-axis current setpoints are then controlled by FOC (Field-Oriented Control) to output an effective voltage vector to the fan motor, so that the fan motor adjusts its output capability according to the input effective voltage vector, which means adjusting the actual characteristic value.

[0085] In other embodiments, after each acquisition of the current fan speed and the current characteristic value of the characteristic parameter, open-loop adjustment of the fan speed is performed. If the fan is a centrifugal fan, if the current characteristic value is greater than the target characteristic value, the fan speed is reduced by a fixed step size; if the current characteristic value is less than the target characteristic value, the fan speed is increased by a fixed step size, thereby achieving open-loop control of the fan speed and reducing the difference between the actual and target characteristic values. If the fan is an axial flow fan, if the current characteristic value is greater than the target characteristic value, the fan speed is increased by a fixed step size; if the current characteristic value is less than the target characteristic value, the fan speed is reduced by a fixed step size, thereby achieving open-loop control of the fan speed.

[0086] In some implementations, the air conditioning equipment may be configured with multiple fan control modes, such as a constant speed control mode and a constant air volume control mode. After the air conditioning equipment is turned on, it checks whether a selection command for the constant air volume control mode has been received. If not, it enters the constant speed control mode, controlling the fan to run at the set target speed. If so, it enters the constant air volume control mode. After entering the constant air volume control mode, it obtains the user-set current target air volume, retrieves the target surface model from M surface models based on the current target air volume, and inputs the current target air volume into the target surface model to obtain the target curve model corresponding to the current target air volume.

[0087] Taking torque current as an example, according to a preset control cycle, the current speed and torque current of the fan are periodically acquired. The current torque current is input to the target curve model to obtain the target torque current. The current torque current is filtered, and the current difference between the filtered current torque current and the target torque current is calculated. The current difference is then limited by IP control to obtain the current vector and amplitude. Based on the current vector and amplitude, FOC control is performed to output an effective voltage vector to the fan motor, so that the motor adjusts its output capacity according to the input effective voltage vector. Thus, closed-loop control of the fan speed is achieved by adjusting the fan's output capacity.

[0088] Based on the same inventive concept, this invention provides a constant air volume control device for a fan, such as... Figure 4 As shown, the constant air volume control device for the fan includes: a parameter value acquisition unit 401, used to periodically acquire the current rotational speed value and the current characteristic value of the characteristic parameter of the fan; a parameter processing unit 402, used to input the current target air volume and the current rotational speed value into a pre-established target surface model to obtain the target characteristic value of the characteristic parameter, wherein the target surface model is a three-dimensional surface characterizing the relationship between the rotational speed of the fan and the characteristic parameter within the target air volume range, and the current target air volume belongs to the target air volume range; and a rotational speed adjustment unit 403, used to adjust the rotational speed of the fan according to the relationship between the target characteristic value and the current characteristic value.

[0089] In some embodiments, the constant air volume control device further includes a model acquisition unit, configured to: determine the target air volume interval where the current target air volume is located from M pre-divided air volume intervals, wherein the M air volume intervals are divided into constant air volume adjustment ranges of the fan, and M is an integer greater than 1; and acquire the target surface model from M pre-established surface models according to the target air volume interval, wherein the M surface models correspond one-to-one with the M air volume intervals.

[0090] In other embodiments, the target air volume range is the constant air volume adjustment range of the fan, and the target surface model is pre-established for the constant air volume adjustment range of the fan.

[0091] In some embodiments, the constant air volume control device further includes an air volume setting unit, used to: acquire an air volume setting command; and set a current target air volume within the constant air volume adjustment range of the fan according to the air volume setting command, wherein the constant air volume adjustment range is a continuous air volume range that characterizes the target air volume as infinitely adjustable.

[0092] In some embodiments, the parameter processing unit 402 includes: a first conversion subunit, configured to input the current target air volume into the target surface model before periodically acquiring the current rotational speed value of the fan and the current characteristic value of the characteristic parameter, to obtain a target curve model corresponding to the current target air volume, wherein the target curve model characterizes the relationship between the rotational speed of the fan and the characteristic parameter under the current target air volume; and after each acquisition of the current rotational speed value, input the current rotational speed value into the target curve model to obtain the target characteristic value.

[0093] In other embodiments, the parameter processing unit 402 includes: a second conversion subunit, configured to, after each acquisition of the current rotational speed value, input the current target air volume into the target surface model to obtain a target curve model corresponding to the current target air volume, wherein the target curve model characterizes the relationship between the fan rotational speed and characteristic parameters under the current target air volume; and input the current rotational speed value into the target curve model to obtain the target characteristic value.

[0094] In some implementations, each of the M surface models is pre-established based on three-dimensional mapping data within the airflow range corresponding to that surface model; wherein, the three-dimensional mapping data within each airflow range includes data mapping between airflow, fan speed and characteristic parameters within that airflow range.

[0095] In some embodiments, the constant airflow control device further includes a first modeling unit for pre-establishing M surface models, wherein the first modeling unit includes: a curve modeling subunit for establishing N curve models corresponding to N candidate airflow values, each curve model representing the relationship between fan speed and characteristic parameters under the candidate airflow value, where N is an integer greater than 1; a first data acquisition subunit for obtaining full three-dimensional mapping data based on the N curve models, wherein each mapping data in the full three-dimensional mapping data is a mapping of fan speed, airflow, and characteristic parameters; and a first surface modeling subunit for dividing the full three-dimensional mapping data into M parts according to the M airflow intervals, and generating the M surface models one-to-one according to the M parts of three-dimensional mapping data.

[0096] In some implementations, the target surface model is established based on pre-determined full three-dimensional mapping data, which includes data mapping between air volume, fan speed and the characteristic parameters within the constant air volume adjustment range.

[0097] In some embodiments, the constant airflow control device further includes a second modeling unit for pre-establishing the target surface model, wherein the second modeling unit includes: a curve modeling subunit for establishing N curve models corresponding to N candidate airflow values, each curve model representing the relationship between fan speed and characteristic parameters under that candidate airflow value, where N is an integer greater than 1; a second data acquisition subunit for obtaining full three-dimensional mapping data based on the N curve models, where each mapping data in the full three-dimensional mapping data is a mapping of fan speed, airflow, and characteristic parameters; and a second surface modeling subunit for performing surface modeling based on the full three-dimensional mapping data to obtain the target surface model.

[0098] In some implementations, the curve modeling subunit is used to: for each of the N candidate air volume values, obtain multiple rotational speed values ​​and multiple feature values ​​of the feature parameters under that candidate air volume value, and establish a curve model corresponding to that candidate air volume value based on the multiple rotational speed values ​​and the multiple feature values ​​of the feature parameters.

[0099] In some embodiments, the fan is a centrifugal fan, and the speed regulation unit 403 is used to: reduce the speed of the fan if the current characteristic value is greater than the target characteristic value; and increase the speed of the fan if the current characteristic value is less than the target characteristic value.

[0100] The specific functions of each functional unit in the above-mentioned device have been described in detail in the constant air volume control method for fans provided in some embodiments of the present invention, and will not be elaborated here.

[0101] Based on the same inventive concept, embodiments of the present invention also provide an air conditioning device, which includes a fan, such as... Figure 5 As shown, the air conditioning device further includes: a processor 502; and a memory 504 for storing executable instructions of the processor 502, wherein the processor 502 is configured to execute the instructions to implement the constant air volume control method for the fan described in any of the above embodiments.

[0102] Among them, Figure 5In this document, a bus architecture (represented by bus 500) is used. Bus 500 may include any number of interconnected buses and bridges, linking various circuits including one or more processors represented by processor 502 and memory represented by memory 504. Bus 500 may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 505 provides an interface between bus 500 and receiver 501 and transmitter 503. Receiver 501 and transmitter 503 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 502 is responsible for managing bus 500 and general processing, while memory 504 can be used to store data used by processor 502 during operation.

[0103] Based on the same inventive concept, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the constant air volume control method for a fan as described in any of the above embodiments.

[0104] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 Devices that specify the functions in one or more boxes.

[0105] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including an instruction device, which is implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0106] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0107] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0108] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0109] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A method for controlling the constant air volume of a fan, characterized in that, include: The current rotational speed and current characteristic values ​​of the characteristic parameters of the fan are periodically acquired. The current target air volume and the current rotation speed are input into a pre-established target surface model to obtain the target feature value of the feature parameter. The target surface model is a three-dimensional surface that characterizes the relationship between the rotation speed of the fan and the feature parameter within the target air volume range. The current target air volume belongs to the target air volume range. The fan speed is adjusted according to the relationship between the target feature value and the current feature value.

2. The method as described in claim 1, characterized in that, Before inputting the current target airflow and the current rotational speed values ​​into the pre-established target surface model, the method further includes: The target air volume range where the current target air volume is located is determined from the M pre-divided air volume ranges, wherein the M air volume ranges are divided into the constant air volume adjustment range of the fan, and M is an integer greater than 1; Based on the target air volume range, the target surface model is obtained from the M pre-established surface models, and the M surface models correspond one-to-one with the M air volume ranges.

3. The method as described in claim 1, characterized in that, The target air volume range is the constant air volume adjustment range of the fan, and the target surface model is pre-established for the constant air volume adjustment range of the fan.

4. The method according to any one of claims 1-3, characterized in that, Before obtaining the current rotational speed of the fan and the current characteristic value of the characteristic parameter, the method further includes: Obtain the airflow setting command; According to the air volume setting command, the current target air volume is set within the constant air volume adjustment range of the fan, wherein the constant air volume adjustment range is a continuous air volume range that characterizes the target air volume as infinitely adjustable.

5. The method as described in claim 1, characterized in that, The step of inputting the current target air volume and the current rotational speed value into a pre-established target surface model to obtain the target feature values ​​of the feature parameters includes: Before periodically acquiring the current rotational speed of the fan and the current characteristic value of the characteristic parameter, the current target air volume is input into the target surface model to obtain a target curve model corresponding to the current target air volume. The target curve model characterizes the relationship between the rotational speed of the fan and the characteristic parameter under the current target air volume. After each acquisition of the current rotational speed value, the current rotational speed value is input into the target curve model to obtain the target feature value.

6. The method as described in claim 1, characterized in that, The step of inputting the current target air volume and the current rotational speed value into a pre-established target surface model to obtain the target feature values ​​of the feature parameters includes: After each acquisition of the current rotational speed value, the current target air volume is input into the target surface model to obtain the target curve model corresponding to the current target air volume. The target curve model represents the relationship between the rotational speed of the fan and the characteristic parameters under the current target air volume. The current rotational speed value is input into the target curve model to obtain the target feature value.

7. The method as described in claim 2, characterized in that, Each of the M surface models is pre-established based on the three-dimensional mapping data within the air volume range corresponding to that surface model. The three-dimensional mapping data within each air volume range includes data mapping between air volume, fan speed, and characteristic parameters within that air volume range.

8. The method as described in claim 7, characterized in that, Each of the M surface models is pre-established through the following steps: Establish N curve models corresponding to N candidate air volume values. Each curve model represents the relationship between the fan speed and characteristic parameters under that candidate air volume value, where N is an integer greater than 1. The full three-dimensional mapping data is obtained based on the N curve models. Each mapping data in the full three-dimensional mapping data is a mapping of the fan speed, air volume and characteristic parameters. The full three-dimensional mapping data is divided into M parts according to the M air volume intervals, and the M surface models are generated one-to-one according to the M parts of the three-dimensional mapping data.

9. The method as described in claim 3, characterized in that, The target surface model is established based on pre-measured full three-dimensional mapping data, which includes the mapping data between air volume, fan speed and characteristic parameters within the constant air volume adjustment range.

10. The method as described in claim 9, characterized in that, The target surface model is pre-established through the following steps: Establish N curve models corresponding to N candidate air volume values. Each curve model represents the relationship between the fan speed and characteristic parameters under that candidate air volume value, where N is an integer greater than 1. The full three-dimensional mapping data is obtained based on the N curve models. Each mapping data in the full three-dimensional mapping data is a mapping of the fan speed, air volume and characteristic parameters. The target surface model is obtained by performing surface modeling based on the full 3D mapping data.

11. The method as described in claim 8 or 10, characterized in that, The establishment of N curve models corresponding to N candidate air volume values ​​includes: For each of the N candidate air volume values, obtain multiple rotational speed values ​​and multiple characteristic values ​​of the characteristic parameters under that candidate air volume value, and establish a curve model corresponding to that candidate air volume value based on the multiple rotational speed values ​​and multiple characteristic values ​​of the characteristic parameters.

12. The method according to any one of claims 1-3, characterized in that, The fan is a centrifugal fan, and adjusting the fan speed according to the relationship between the target feature value and the current feature value includes: If the current feature value is greater than the target feature value, reduce the speed of the fan; If the current feature value is less than the target feature value, increase the speed of the fan.

13. A constant air volume control device for a fan, characterized in that, include: The parameter value acquisition unit is used to periodically acquire the current speed value and the current characteristic value of the characteristic parameters of the fan; The parameter processing unit is used to input the current target air volume and the current rotation speed value into a pre-established target surface model to obtain the target feature value of the feature parameter. The target surface model is a three-dimensional surface that characterizes the relationship between the rotation speed of the fan and the feature parameter within the target air volume range. The current target air volume belongs to the target air volume range. The speed adjustment unit is used to adjust the speed of the fan according to the relationship between the target feature value and the current feature value.

14. An air conditioning device, characterized in that, The device includes a fan and further comprises: a processor; and a memory for storing executable instructions of the processor, wherein the processor is configured to execute the instructions to implement the constant air volume control method as described in any one of claims 1 to 12.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the constant air volume control method according to any one of claims 1 to 12.

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