CN113834176A - Constant air volume curve calibration method, control terminal of equipment and readable storage medium - Google Patents
Constant air volume curve calibration method, control terminal of equipment and readable storage medium Download PDFInfo
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- CN113834176A CN113834176A CN202110946738.7A CN202110946738A CN113834176A CN 113834176 A CN113834176 A CN 113834176A CN 202110946738 A CN202110946738 A CN 202110946738A CN 113834176 A CN113834176 A CN 113834176A
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- air volume
- rotating speed
- fan
- current
- baffle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/75—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity for maintaining constant air flow rate or air velocity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a calibration method of a constant air volume curve, a control terminal of equipment and a readable storage medium, wherein the equipment comprises the control terminal, a fan, a baffle plate and an anemometer, the baffle plate is arranged between the fan and the anemometer, and the method is executed by the control terminal and comprises the following steps: controlling and recording the shielding degree of the baffle and the set rotating speed of the fan; measuring and recording air volume data of the air gauge, current of the fan and actual rotating speed when the shielding degree and the set rotating speed are in an appointed state; calculating a curved surface equation of the relation between the air volume data, the current and the actual rotating speed through a curved surface fitting algorithm; and obtaining the relation between the current and the actual rotating speed under the preset air volume according to a curved surface equation. According to the method, the shielding degree of the baffle and the actual rotating speed of the fan are adjusted in an open loop mode, compared with a closed loop adjusting mode in the prior art, the calibration time is greatly shortened, and the problems of long calibration process period and low efficiency in the prior art are solved.
Description
Technical Field
The invention relates to the field of kitchen air conditioners, in particular to a constant air volume curve calibration method, a control terminal of equipment and a readable storage medium.
Background
Along with the improvement of living standard, the requirement of people on comfort in life is gradually improved, so that the sales volume of the kitchen air conditioner is continuously increased. The kitchen air conditioner is usually of a constant air volume type, but due to the oil fume environment of a kitchen, when the range hood works, the air volume of the kitchen air conditioner can change along with the change of the resistance of a pipeline, if a control mode of constant rotating speed or constant current is adopted, when the static pressure of an air outlet of the air conditioner changes due to the change of the external environment, the air exhaust volume of the air conditioner can also change.
The existing constant air volume control methods are all in a mode of taking target air volume as constant control volume, testing at different rotating speeds and acquiring motor current and torque, although the acquired data are more direct and accurate, in the actual calibration process, under the condition of a certain rotating speed, closed-loop regulation of the target air volume to a set value is relatively difficult. In addition, in order to ensure the control effect of the constant air volume, data under different set air volumes need to be calibrated, and theoretically, the more the data, the better the data, and the longer the whole calibration process is.
In summary, how to provide a calibration method is faster and more efficient than the prior art, which is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a calibration method for a constant air volume curve, a control terminal of a device, and a readable storage medium, which solve the problems of long calibration period and low efficiency in the prior art.
The invention provides a calibration method of a constant air volume curve, which is applied to a constant air volume curve calibration device, wherein the device comprises a control terminal, a fan, a baffle plate and an air volume meter, the baffle plate is arranged between the fan and the air volume meter, and the method is executed by the control terminal and comprises the following steps:
controlling and recording the shielding degree of the baffle and the set rotating speed of the fan;
measuring and recording air volume data of the air gauge, current of the fan and actual rotating speed when the shielding degree and the set rotating speed are in an appointed state;
calculating a curved surface equation of the relation among the air volume data, the current and the actual rotating speed through a curved surface fitting algorithm;
and obtaining the relation between the current and the actual rotating speed under the preset air volume according to the curved surface equation.
In this scheme, when the degree of sheltering from with the settlement rotational speed is in the assigned state, the measurement and record, the amount of wind data of anemometer and the electric current of fan specifically include:
a1, dividing the shielding degree of the baffle into N gears, and dividing the set rotating speed of the fan into M gears, wherein N and M are integers greater than 1;
a2, initializing that the shielding degree and the set rotating speed are both in a first gear;
a3, sequentially increasing the set rotating speed and recording the air volume data of the air gauge, the current of the fan and the actual rotating speed until the rotating speed of the fan is in an M gear;
a4, increasing the gear of the shielding degree, and recording the air quantity data of an air gauge, the current of the fan and the actual rotating speed;
a5, repeating the steps A3 and A4 until the shielding degree is in the N gear.
In the scheme, the baffle is controlled by the stepping motor, and the control terminal controls the shielding degree of the baffle by controlling the stroke of the stepping motor.
In this scheme, the curve equation for calculating the relationship between the air volume data, the current and the actual rotation speed through a curve fitting algorithm is specifically as follows:
fitting the surface equation using the following quadratic surface equation:
wherein Q is the air volume, wrThe motor speed is shown as I, the current is shown as I, and the fitting parameters to be solved are shown as A, B, C, D, E, F.
In this scheme, the relationship between the current and the actual rotation speed when the preset air volume is obtained according to the curved surface equation is specifically as follows:
and establishing a table with the air volume and the actual rotating speed as coordinates and the current as a target value according to the curved surface equation to finish calibration.
The second aspect of the present invention further provides a control terminal of a constant air volume curve calibration device, where the constant air volume curve calibration device further includes the fan, a baffle plate and an air gauge, the baffle plate is disposed between the fan and the air gauge, and the control terminal includes:
the control unit is used for controlling and recording the shielding degree of the baffle and the set rotating speed of the fan;
the measuring unit is used for measuring and recording air volume data of the air gauge, current of the fan and actual rotating speed when the shielding degree and the set rotating speed are in the designated state;
the calculating unit is used for calculating a curved surface equation of the relationship among the air volume data, the current and the actual rotating speed through a curved surface fitting algorithm;
and the calibration unit is used for obtaining the relation between the current and the actual rotating speed under the preset air volume according to the curved surface equation.
In this scheme, the measurement unit is specifically configured to:
a1, dividing the shielding degree of the baffle into N gears, and dividing the set rotating speed of the fan into M gears, wherein N and M are integers greater than 1;
a2, initializing that the shielding degree and the set rotating speed are both in a first gear;
a3, sequentially increasing the set rotating speed and recording the air volume data of the air gauge, the current of the fan and the actual rotating speed until the rotating speed of the fan is in an M gear;
a4, increasing the gear of the shielding degree, and recording the air quantity data of an air gauge, the current of the fan and the actual rotating speed;
a5, repeating the steps A3 and A4 until the shielding degree is in the N gear.
In this embodiment, the calculating unit is specifically configured to:
fitting the surface equation using the following quadratic surface equation:
wherein Q is the air volume, wrThe motor speed is shown as I, the current is shown as I, and the fitting parameters to be solved are shown as A, B, C, D, E, F.
In this scheme, the calibration unit is specifically configured to:
and establishing a table with the air volume and the actual rotating speed as coordinates and the current as a target value according to the curved surface equation to finish calibration.
A third aspect of the present invention provides a computer-readable storage medium, which includes a program of a method for calibrating a constant air volume curve of a machine, and when the program of the method for calibrating a constant air volume curve is executed by a processor, the steps of the method for calibrating a constant air volume curve as described in any one of the above are implemented.
The invention discloses a calibration method of a constant air volume curve, a control terminal of equipment and a readable storage medium, wherein the shielding degree of a baffle and the set rotating speed of a fan are controlled and recorded; measuring and recording air volume data of the air gauge, current of the fan and actual rotating speed when the shielding degree and the set rotating speed are in an appointed state; calculating a curved surface equation of the relation between the air volume data, the current and the actual rotating speed through a curved surface fitting algorithm; under the predetermined amount of wind is obtained according to the curved surface equation, the relation of current and actual rotational speed time, the adjustment baffle that adopts the open-loop shelters from degree and the actual rotational speed of fan, the relation between the actual amount of wind and the current and the actual rotational speed of fan under the different operating modes has been simulated, compare the form of closed-loop control among the prior art, very big time of demarcation has been shortened, simultaneously through the mode of curved surface data fitting, make the data of acquireing more accurate, measuring error's influence has been reduced, the problem of calibration process cycle length among the prior art, inefficiency has been solved.
Drawings
FIG. 1 is a flow chart illustrating a method for calibrating a constant air volume curve according to the present application;
FIG. 2 shows a schematic structural diagram of a constant air volume curve calibration device in an embodiment of the present application;
FIG. 3 is a schematic diagram of a gear control table of a calibration method for a constant air volume curve in the embodiment of the application;
FIG. 4 is a schematic diagram of a calibration table of a calibration method of a constant air volume curve in the embodiment of the present application;
fig. 5 shows a schematic structural diagram of a control terminal of a constant air volume curve calibration device according to the present application.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The invention provides a calibration method of a constant air volume curve in a first aspect, and fig. 1 shows a flow chart of the calibration method of the constant air volume curve in the present application.
As shown in fig. 1, the present application discloses a constant air volume curve calibration method, which is applied to a constant air volume curve calibration device, where the device includes a control terminal, a fan, a baffle plate and an air volume meter, the baffle plate is disposed between the fan and the air volume meter, and the method is executed by the control terminal, and includes the following steps:
s102, controlling and recording the shielding degree of the baffle and the set rotating speed of the fan;
s104, measuring and recording air volume data of the air gauge, current of the fan and actual rotating speed when the shielding degree and the set rotating speed are in the designated state;
s106, calculating a curved surface equation of the relation among the air volume data, the current and the actual rotating speed through a curved surface fitting algorithm;
and S108, obtaining the relation between the current and the actual rotating speed time under the preset air volume according to the curved surface equation.
Please refer to fig. 2, and fig. 2 shows a schematic structural diagram of a constant air volume curve calibration device in an embodiment of the present application. It can be understood that the baffle is arranged on the air channel between the fan and the air gauge, and when the fan rotates at a set rotating speed, the air gauge measures air volume data shielded by the baffle. The baffle is used for simulating the working conditions of different blocking degrees of the air duct in practical application, namely the working conditions when the static pressure of the air outlet changes when the external environment changes. The control terminal is used for controlling the shielding degree of the baffle and the set rotating speed of the fan, and it can be understood that under the condition that the shielding degree of the baffle is different, namely when the static pressure of the air outlet changes, the actual rotating speed of the fan can be influenced, so that when the shielding degree and the set rotating speed are in an appointed state, after data are stable, not only the actual air volume data measured by the air gauge and the current of the fan need to be recorded, but also the actual rotating speed of the fan needs to be recorded, and the purpose is to determine the measuring state and determine the system boundary conveniently and subsequently.
It should be noted that, by changing the shielding degree of the baffle and the set rotating speed of the fan, the air volume data, the current and the actual rotating speed under different working conditions are recorded, and a curved surface equation of the relationship between the air volume data, the current and the actual rotating speed can be obtained through a curved surface fitting algorithm. After the curved surface equation is obtained, when the constant air volume control is needed, the current required by the fan can be obtained according to the target air volume and the actual current by combining the curved surface equation as long as the air volume needed to be achieved is determined, and the constant air volume control is achieved by continuously iterating until the size of the motor control current is matched with the index current. .
It should be noted that, in the embodiment of the present invention, the current data of the fan is recorded, and actually, the torque of the fan may be measured and recorded instead, and a curved surface equation of the relationship between the air volume data, the torque, and the actual rotation speed is calculated, and when the constant air volume control is performed, the constant air volume control is realized by controlling the magnitude of the torque. Since the torque and the current can be converted by a fixed formula according to the property of the fan, the scheme of replacing the current with the torque also belongs to the protection scope of the invention.
It should be noted that the calibration method for the constant air volume curve provided by the embodiment of the invention includes controlling and recording the shielding degree of the baffle and the set rotating speed of the fan; measuring and recording air volume data of the air gauge, current of the fan and actual rotating speed when the shielding degree and the set rotating speed are in an appointed state; calculating a curved surface equation of the relation between the air volume data, the current and the actual rotating speed through a curved surface fitting algorithm; and obtaining the relation between the current and the actual rotating speed time under the preset air volume according to a curved surface equation. Degree and fan actual rotational speed are sheltered from to the adjustment baffle through the open-loop, have simulated the relation between the electric current of actual amount of wind and fan under the different work condition and the actual rotational speed, compare in prior art well closed loop control's form, very big shortening the time of demarcation, simultaneously through the mode of curved surface data fitting for the data of acquireing are more accurate, have reduced measuring error's influence, have solved among the prior art problem of demarcation process cycle length, inefficiency.
According to the embodiment of the present invention, the measuring and recording the air volume data of the air volume meter and the current of the fan when the shielding degree and the set rotation speed are in the designated state specifically includes:
a1, dividing the shielding degree of the baffle into N gears, and dividing the set rotating speed of the fan into M gears, wherein N and M are integers greater than 1;
a2, initializing that the shielding degree and the set rotating speed are both in a first gear;
a3, sequentially increasing the set rotating speed and recording the air volume data of the air gauge, the current of the fan and the actual rotating speed until the rotating speed of the fan is in an M gear;
a4, increasing the gear of the shielding degree, and recording the air quantity data of an air gauge, the current of the fan and the actual rotating speed;
a5, repeating the steps A3 and A4 until the shielding degree is in the N gear.
Please refer to fig. 3, fig. 3 is a schematic diagram of a gear control table of a calibration method for a constant air volume curve in the embodiment of the present application. The degree of sheltering from of baffle can be divided into N gears, and the setting rotational speed of fan also from the gear number of the gear that is divided into M gear of lowest speed to highest even, with the gear number of ordinate identification baffle in the picture to the setting rotational speed of abscissa identification fan. In the embodiment, the fixing baffle is preferably the first gear, then the rotating speed of the fan is adjusted in sequence, and after the parameters are stable, the current air volume data, the current of the fan and the actual rotating speed are recorded. Preferably, the stability of the parameter can be determined by using whether the change of the air volume data, the actual rotating speed and the current within a certain time does not exceed a set threshold. And after the data measurement and recording under the condition of all set rotating speeds under the baffle plate of the first gear are completed, adjusting the shielding degree of the baffle plate to be the second gear, initializing the rotating speed to be the first gear, and repeating the operations until all the shielding degrees, the air volume data under all the set rotating speeds, the actual rotating speed and the current are tested.
It should be noted that, comprehensive measurement can be realized by fixing the set rotating speed and measuring the air volume data and the motor data under different shielding degrees one by one, and details are not repeated here.
According to the embodiment of the invention, the baffle is controlled by a stepping motor, and the control terminal controls the shielding degree of the baffle by controlling the stroke of the stepping motor.
It should be noted that, since the stepping motor is a device for converting an electric pulse into a discrete mechanical motion, and has a good data control characteristic, the embodiment of the present invention controls the shielding degree of the baffle by controlling the stroke of the stepping motor through the control terminal. It is understood that the connection between the stepping motor and the baffle only needs to be a simple mechanical design, and can be easily implemented by those skilled in the art, and will not be described in detail.
According to the embodiment of the present invention, the surface equation for calculating the relationship between the air volume data, the current and the actual rotation speed through the surface fitting algorithm specifically includes:
fitting the surface equation using the following quadratic surface equation:
wherein Q is the air volume, wrThe motor speed is shown as I, the current is shown as I, and the fitting parameters to be solved are shown as A, B, C, D, E, F.
It should be noted that, preferably, the standard equation for surface fitting is in the form of an ellipsoid surface,
wherein Q is the air volume, wrThe motor speed, I is the current (or torque), and A, B, C, D, E, F is the belt fitting parameter. Further, the surface fitting method adopts a least square method, and calculates the fitting parameters of the belt solution according to a set fitting program: A. b, C, D, E, F are provided.
According to the embodiment of the present invention, the relationship between the current and the actual rotation speed when the preset air volume is obtained according to the curved surface equation is specifically:
and establishing a table with the air volume and the actual rotating speed as coordinates and the current as a target value according to the curved surface equation to finish calibration.
Please refer to fig. 4, and fig. 4 is a schematic diagram of a calibration table of a calibration method for a constant air volume curve in the embodiment of the present application. It can be understood that after the curved surface equation is obtained, the corresponding current value is obtained on the fitted curved surface by taking the required air volume value as a target and the rotating speed as an index, and the corresponding current value is recorded until all the working point data are obtained to obtain a table, so that the calibration is completed. After the curved surface equation is obtained, when the constant air volume control is needed, the current required by the fan can be obtained according to the target air volume and the actual current by combining the curved surface equation as long as the air volume needed to be achieved is determined, and the constant air volume control is achieved by continuously iterating until the size of the motor control current is matched with the index current.
According to the embodiment of the present invention, before calculating the curved surface equation of the relationship between the air volume data, the current and the actual rotation speed through a curved surface fitting algorithm, the method further includes:
the position of the shutter is changed and steps S102 to S104 are repeated.
It should be noted that, in order to make the calibration result more accurate, the number of test points may be increased appropriately, for example, the number of baffles is increased. The method provided by the embodiment of the invention is realized by changing the position of the baffle, in particular to change the distance between the baffle positioned in the air duct and the fan.
The second aspect of the present invention provides a control terminal of a constant air volume curve calibration device, and fig. 5 shows a schematic structural diagram of the control terminal of the constant air volume curve calibration device according to the present application.
As shown in fig. 5, the present invention discloses a control terminal of a constant air volume curve calibration device, where the constant air volume curve calibration device further includes a fan, a baffle plate and an air volume meter, the baffle plate is disposed between the fan and the air volume meter, and the control terminal includes:
the control unit 502 is used for controlling and recording the shielding degree of the baffle and the set rotating speed of the fan;
a measuring unit 504, configured to measure and record air volume data of the air volume meter, current of the fan, and an actual rotation speed when the shielding degree and the set rotation speed are in a specified state;
a calculating unit 506, configured to calculate a curved surface equation of a relationship between the air volume data, the current, and the actual rotation speed through a curved surface fitting algorithm;
and the calibration unit 508 is configured to obtain a relationship between the current and the actual rotation speed time at a preset air volume according to the curved surface equation.
Please refer to fig. 2, and fig. 2 shows a schematic structural diagram of a constant air volume curve calibration device in an embodiment of the present application. It can be understood that the baffle is arranged on the air channel between the fan and the air gauge, and when the fan rotates at a set rotating speed, the air gauge measures air volume data shielded by the baffle. The baffle is used for simulating the working conditions of different blocking degrees of the air duct in practical application, namely the working conditions when the static pressure of the air outlet changes when the external environment changes. The control terminal is used for controlling the shielding degree of the baffle and the set rotating speed of the fan, and it can be understood that under the condition that the shielding degree of the baffle is different, namely when the static pressure of the air outlet changes, the actual rotating speed of the fan can be influenced, so that when the shielding degree and the set rotating speed are in an appointed state, after data are stable, not only the actual air volume data measured by the air gauge and the current of the fan need to be recorded, but also the actual rotating speed of the fan needs to be recorded, and the purpose is to determine the measuring state and determine the system boundary conveniently and subsequently.
It should be noted that, by changing the shielding degree of the baffle and the set rotating speed of the fan, the air volume data, the current and the actual rotating speed under different working conditions are recorded, and a curved surface equation of the relationship between the air volume data, the current and the actual rotating speed can be obtained through a curved surface fitting algorithm. After the curved surface equation is obtained, when the constant air volume control is needed, the current required by the fan can be obtained according to the target air volume and the actual current by combining the curved surface equation as long as the air volume needed to be achieved is determined, and the constant air volume control is achieved by continuously iterating until the size of the motor control current is matched with the index current. .
It should be noted that, in the embodiment of the present application, the current data of the fan is recorded, and actually, the torque of the fan may be measured and recorded instead, and a curved surface equation of the relationship between the air volume data, the torque, and the actual rotation speed is calculated, and when the constant air volume control is performed, the constant air volume control is realized by controlling the magnitude of the torque. Since the torque and the current can be converted by a fixed formula according to the property of the fan, the scheme of replacing the current with the torque also belongs to the protection scope of the invention.
According to an embodiment of the present invention, the measurement unit is specifically configured to:
a1, dividing the shielding degree of the baffle into N gears, and dividing the set rotating speed of the fan into M gears, wherein N and M are integers greater than 1;
a2, initializing that the shielding degree and the set rotating speed are both in a first gear;
a3, sequentially increasing the set rotating speed and recording the air volume data of the air gauge, the current of the fan and the actual rotating speed until the rotating speed of the fan is in an M gear;
a4, increasing the gear of the shielding degree, and recording the air quantity data of an air gauge, the current of the fan and the actual rotating speed;
a5, repeating the steps A3 and A4 until the shielding degree is in the N gear.
Please refer to fig. 3, fig. 3 is a schematic diagram of a gear control table of a calibration method for a constant air volume curve in the embodiment of the present application. The degree of sheltering from of baffle can be divided into N gears, and the setting rotational speed of fan also from the gear number of the gear that is divided into M gear of lowest speed to highest even, with the gear number of ordinate identification baffle in the picture to the setting rotational speed of abscissa identification fan. In the embodiment, the fixing baffle is preferably the first gear, then the rotating speed of the fan is adjusted in sequence, and after the parameters are stable, the current air volume data, the current of the fan and the actual rotating speed are recorded. Preferably, the stability of the parameter can be determined by using whether the change of the air volume data, the actual rotating speed and the current within a certain time does not exceed a set threshold. And after the data measurement and recording under the condition of all set rotating speeds under the baffle plate of the first gear are completed, adjusting the shielding degree of the baffle plate to be the second gear, initializing the rotating speed to be the first gear, and repeating the operations until all the shielding degrees, the air volume data under all the set rotating speeds, the actual rotating speed and the current are tested.
It should be noted that, comprehensive measurement can be realized by fixing the set rotating speed and measuring the air volume data and the motor data under different shielding degrees one by one, and details are not repeated here.
According to the embodiment of the invention, the baffle is controlled by a stepping motor, and the control terminal controls the shielding degree of the baffle by controlling the stroke of the stepping motor.
It should be noted that, since the stepping motor is a device for converting an electric pulse into a discrete mechanical motion, and has a good data control characteristic, the embodiment of the present invention controls the shielding degree of the baffle by controlling the stroke of the stepping motor through the control terminal. It is understood that the connection between the stepping motor and the baffle only needs to be a simple mechanical design, and can be easily implemented by those skilled in the art, and will not be described in detail.
According to an embodiment of the present invention, the computing unit is specifically configured to:
fitting the surface equation using the following quadratic surface equation:
wherein Q is the air volume, wrThe motor speed is shown as I, the current is shown as I, and the fitting parameters to be solved are shown as A, B, C, D, E, F.
It should be noted that, preferably, the standard equation for surface fitting is in the form of an ellipsoid surface,
wherein Q is the air volume, wrThe motor speed, I is the current (or torque), and A, B, C, D, E, F is the belt fitting parameter. Further, the surface fitting method adopts a least square method, and calculates the fitting parameters of the belt solution according to a set fitting program: A. b, C, D, E, F are provided.
According to an embodiment of the present invention, the calibration unit is specifically configured to:
and establishing a table with the air volume and the actual rotating speed as coordinates and the current as a target value according to the curved surface equation to finish calibration.
Please refer to fig. 4, and fig. 4 is a schematic diagram of a calibration table of a calibration method for a constant air volume curve in the embodiment of the present application. It can be understood that after the curved surface equation is obtained, the corresponding current value is obtained on the fitted curved surface by taking the required air volume value as a target and the rotating speed as an index, and the corresponding current value is recorded until all the working point data are obtained to obtain a table, so that the calibration is completed. After the curved surface equation is obtained, when the constant air volume control is needed, the current required by the fan can be obtained according to the target air volume and the actual current by combining the curved surface equation as long as the air volume needed to be achieved is determined, and the constant air volume control is achieved by continuously iterating until the size of the motor control current is matched with the index current.
A third aspect of the present invention provides a computer-readable storage medium, which includes a program for a method of calibrating a constant air volume curve of a machine, and when the program for the method of calibrating a constant air volume curve is executed by a processor, the steps of the method of calibrating a constant air volume curve as described in any one of the above are implemented.
The invention discloses a calibration method of a constant air volume curve, a control terminal of equipment and a readable storage medium, wherein the shielding degree of a baffle and the set rotating speed of a fan are controlled and recorded; measuring and recording air volume data of the air gauge, current of the fan and actual rotating speed when the shielding degree and the set rotating speed are in an appointed state; calculating a curved surface equation of the relation between the air volume data, the current and the actual rotating speed through a curved surface fitting algorithm; under the predetermined amount of wind is obtained according to the curved surface equation, the relation of current and actual rotational speed time, the adjustment baffle that adopts the open-loop shelters from degree and the actual rotational speed of fan, the relation between the actual amount of wind and the current and the actual rotational speed of fan under the different operating modes has been simulated, compare the form of closed-loop control among the prior art, very big time of demarcation has been shortened, simultaneously through the mode of curved surface data fitting, make the data of acquireing more accurate, measuring error's influence has been reduced, the problem of calibration process cycle length among the prior art, inefficiency has been solved.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media that can store program code.
Claims (10)
1. A calibration method of a constant air volume curve is applied to a constant air volume curve calibration device, the device comprises a control terminal, a fan, a baffle plate and an air gauge, the baffle plate is arranged between the fan and the air gauge, and the method is executed by the control terminal and comprises the following steps:
controlling and recording the shielding degree of the baffle and the set rotating speed of the fan;
measuring and recording air volume data of the air gauge, current of the fan and actual rotating speed when the shielding degree and the set rotating speed are in an appointed state;
calculating a curved surface equation of the relation among the air volume data, the current and the actual rotating speed through a curved surface fitting algorithm;
and obtaining the relation between the current and the actual rotating speed under the preset air volume according to the curved surface equation.
2. The method for calibrating a constant air volume curve according to claim 1, wherein the measuring and recording the air volume data of the air volume meter and the current of the fan when the shielding degree and the set rotating speed are in the designated state specifically comprises:
a1, dividing the shielding degree of the baffle into N gears, and dividing the set rotating speed of the fan into M gears, wherein N and M are integers greater than 1;
a2, initializing that the shielding degree and the set rotating speed are both in a first gear;
a3, sequentially increasing the set rotating speed and recording the air volume data of the air gauge, the current of the fan and the actual rotating speed until the rotating speed of the fan is in an M gear;
a4, increasing the gear of the shielding degree, and recording the air quantity data of an air gauge, the current of the fan and the actual rotating speed;
a5, repeating the steps A3 and A4 until the shielding degree is in the N gear.
3. The method for calibrating the constant air volume curve according to claim 2, wherein the baffle is controlled by a stepping motor, and the control terminal controls the shielding degree of the baffle by controlling the stroke of the stepping motor.
4. The method for calibrating the constant air volume curve according to claim 1, wherein the surface equation for calculating the relationship among the air volume data, the current and the actual rotating speed through a surface fitting algorithm is specifically as follows: fitting the surface equation using the following quadratic surface equation:
wherein Q is the air volume, wrThe motor speed is shown as I, the current is shown as I, and the fitting parameters to be solved are shown as A, B, C, D, E, F.
5. The method for calibrating the constant air volume curve according to claim 1, wherein the relationship between the current and the actual rotating speed is specifically as follows when the preset air volume is obtained according to the curved surface equation:
and establishing a table with the air volume and the actual rotating speed as coordinates and the current as a target value according to the curved surface equation to finish calibration.
6. The utility model provides a control terminal of constant air volume curve calibration equipment, its characterized in that, constant air volume curve calibration equipment still includes fan, baffle and anemometer, the baffle set up in the fan with between the anemometer, control terminal includes:
the control unit is used for controlling and recording the shielding degree of the baffle and the set rotating speed of the fan;
the measuring unit is used for measuring and recording air volume data of the air gauge, current of the fan and actual rotating speed when the shielding degree and the set rotating speed are in the designated state;
the calculating unit is used for calculating a curved surface equation of the relationship among the air volume data, the current and the actual rotating speed through a curved surface fitting algorithm;
and the calibration unit is used for obtaining the relation between the current and the actual rotating speed under the preset air volume according to the curved surface equation.
7. The control terminal of the constant air volume curve calibration device according to claim 6, wherein the measurement unit is specifically configured to:
a1, dividing the shielding degree of the baffle into N gears, and dividing the set rotating speed of the fan into M gears, wherein N and M are integers greater than 1;
a2, initializing that the shielding degree and the set rotating speed are both in a first gear;
a3, sequentially increasing the set rotating speed and recording the air volume data of the air gauge, the current of the fan and the actual rotating speed until the rotating speed of the fan is in an M gear;
a4, increasing the gear of the shielding degree, and recording the air quantity data of an air gauge, the current of the fan and the actual rotating speed;
a5, repeating the steps A3 and A4 until the shielding degree is in the N gear.
8. The control terminal of the constant air volume curve calibration device according to claim 6, wherein the calculation unit is specifically configured to:
fitting the surface equation using the following quadratic surface equation:
wherein Q is the air volume, wrThe motor speed is shown as I, the current is shown as I, and the fitting parameters to be solved are shown as A, B, C, D, E, F.
9. The control terminal of the constant air volume curve calibration device according to claim 6, wherein the calibration unit is specifically configured to:
and establishing a table with the air volume and the actual rotating speed as coordinates and the current as a target value according to the curved surface equation to finish calibration.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a calibration method program of a constant air volume curve, and when the calibration method program of the constant air volume curve is executed by a processor, the steps of a calibration method of a constant air volume curve according to any one of claims 1 to 5 are implemented.
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