CN113823158A - Online fan speed control experiment device and method based on networked control - Google Patents
Online fan speed control experiment device and method based on networked control Download PDFInfo
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Abstract
The invention relates to a fan speed control online experimental device and method based on networked control, and belongs to the field of control science and engineering. The device includes: the device comprises a main control board, a switching power supply, a signal adapter board, a switch, a fan, a camera and a nixie tube. The device supports plug and play, can be controlled by a computer or other equipment supporting networked communication, supports independent control of each fan and cooperative control of four fans, and can be used for verifying different control algorithms. The power supply of each fan subsystem is controllable, and can be automatically turned off when no one uses the fan subsystem, and can be automatically turned on when one uses the fan subsystem, so that large-scale deployment can be conveniently carried out. Meanwhile, the experimental device also provides real-time audio stream and video stream to monitor the running state of the fan, and experimenters can visually see the whole process of the action of the fan through a webpage, so that the understanding of the control process is enhanced.
Description
Technical Field
The invention relates to an experimental device, in particular to a fan speed control online experimental device and method based on networked control.
Background
In engineering professional education, manual experiments are indispensable, however, due to the lack of sufficient experimental equipment, devices and site limitations, many students can only perform professional experiments within a specified time, and most of the time can only perform simulation verification by means of simulation software.
Aiming at the problems, the invention aims to design a new control experiment device to support simultaneous online experiments of multiple persons, realize large-scale online network experiments, meet the experiment requirements of a large number of related professional students, and make up for a weak experiment ring in automatic professional education, thereby deepening the understanding of the related professional students on the control theory and improving the professional literacy and manual experiment capability of the students.
Disclosure of Invention
The invention aims to provide a fan speed control online experimental device based on networked control, which can be deployed in a large scale and used by students and researchers in related professions on line at the same time.
The invention adopts the following technical scheme:
the utility model provides an online experimental apparatus of fan speed control based on networked control which characterized in that, includes the experimental box, sets up the main control board in the experimental box, is connected and a plurality of digital display screen, the power supply module who supplies power for experimental apparatus, a plurality of fans, switch, a plurality of camera and the signal keysets of being connected with the main control board through communication module and main control board.
In the online experimental device for controlling fan speed based on networked control, the power supply assembly comprises a 12V switching power supply and a 5V power supply, wherein the 5V power supply is used for supplying power to the fan, and the 12V switching power supply is used for supplying power to other devices except the fan; the camera and the digital display screen are respectively connected with a 12V switch power supply through a relay board.
In the online experimental device for controlling the fan speed based on the networked control, the communication module adopts the RS485 module, and the digital display screen is connected with the main control board through the RS485 module.
An experimental method of an online experimental device for controlling fan speed based on networked control is characterized by comprising the following steps:
and 2, logging in a network experiment platform through the switch by an experimenter, and applying for the control right of the idle fan to carry out an experiment. After the platform receives the control right application request, can distribute idle fan for the experimenter to send connection instruction to the fan experimental box that corresponds, the main control board receives the order after, will drive the normally open contact closure of the relay on the control signal keysets immediately, connect the power that corresponds the fan subsystem, allow the experimenter to begin to carry out the experiment.
And 3, simulating by experimenters in a control algorithm designed by a network experiment platform of the switch, compiling to generate a corresponding controller code, and downloading the controller code to a corresponding controller for operation. The controller transmits the control quantity calculated by the algorithm to the fan experimental device according to a preset protocol. The main control board in the fan experimental device firstly checks after receiving the data, if the check is correct, the driving voltage at two ends of the fan is changed according to the value of the control quantity, the rotating speed of the fan is adjusted, the rotating speed of the fan at the current moment is collected and packaged into a response packet to be returned to the controller, and if the check is incorrect, the driving voltage at two ends of the fan is kept unchanged, and a corresponding error response is returned to the controller. And meanwhile, the controller checks the received response packet, if the response packet is correct, the controller calculates the control quantity according to the obtained rotating speed feedback and sends the control quantity to the actuator terminal, and if the response packet is wrong, the controller checks the received response packet. . . And discarding the current response packet, and re-receiving a new response packet, and repeating the steps.
And 5, after the experiment is finished, the control right of experimenters is released, the fan equipment is changed from a busy state to an idle state, the platform sends a power supply disconnection instruction to the corresponding fan experimental box, and the main control board controls a relay normally-open contact on the signal adapter board to be disconnected after receiving the instruction, namely, the power supply of the corresponding fan subsystem is disconnected, so that the average power of the operation of the experimental box is reduced, and the full-flow unmanned control is realized.
In the experiment method of the fan speed control online experiment device based on the networked control, an experimenter can establish a corresponding monitoring configuration on a network experiment platform, and the real-time running state of the fan is monitored on line through the camera and the digital display screen corresponding to each fan, so that the real-time rotating speed of the fan is observed, and the real-time rotating speed of the fan is displayed on the digital display screen.
In the above experimental method of the online experimental apparatus for controlling fan speed based on networked control, in step 3, the specific method for checking is as follows:
the data frames are checked by adopting a check code mechanism, each data frame comprises three parts, namely a frame head, effective data and a frame tail, the frame head adopts a fixed byte sequence, the effective data section comprises a data length, a time stamp, data contents and the frame tail, namely a CRC check code of the effective data section. Each check comprises three parts, namely frame head check, data length check and frame tail CRC check, and only when the three parts of checks pass, the current data packet is valid and is analyzed.
In the above experimental method of the online experimental apparatus for controlling fan speed based on networked control, in step 3, the specific method for calculating the controlled variable according to the obtained rotating speed feedback is as follows:
the controller makes a difference according to the real-time rotating speed and the set rotating speed of the fan to obtain the real-time rotating speed difference of the fan, a proportional control component is obtained by calculation after the real-time rotating speed difference is multiplied by a certain proportional coefficient, the historical rotating speed difference of the fan is accumulated and summed, an integral control component is obtained after the historical rotating speed difference is multiplied by an integral coefficient, and the proportional control component and the integral control component are combined to obtain the final control quantity.
Therefore, the invention has the following advantages:
1. the invention has compact structure and small occupied area, and can be deployed in any place;
2. the invention has unique identifier, which is convenient for administrator to manage and deploy in large quantity;
3. the invention integrates all devices required by a control system such as a sensor, an actuator, a controller and the like, is provided with a network camera, and can carry out operation experiments remotely;
4. the invention can automatically turn on or off the experimental device by judging whether the device is used by a person or not, thereby reducing the average power consumption of the device.
Drawings
Fig. 1 is a conceptual diagram of the design of the present invention.
Fig. 2 is an electrical topological architecture diagram of the present invention.
Fig. 3 is a network topology architecture diagram of the present invention.
Description of reference numerals:
1. an Ethernet interface; 2. a main control board; 3. a 220V power interface; 4. 1-4 nixie tubes; 5. 1-4 of fans; 6. a 12V switching power supply; 7. a signal transfer board; 8. a switch; 9. cameras 1-4.
Detailed Description
The salient features and significant improvements of the present invention are further clarified by the following examples, which are intended to be illustrative only and not limiting in any way.
1. A laboratory manager powers on the fan experimental box, connects with a network, modifies the IP address and the port number of the experimental device through the serial port module, and ensures that a controller running a control algorithm can normally communicate with the experimental box;
2. experimenters log in a network experiment platform and apply for the control right of the idle fan to carry out experiments. After the platform receives the control right application request, can distribute idle fan for the experimenter to send connection instruction to the fan experimental box that corresponds, the main control board receives the order after, will drive the normally open contact closure of relay on the control signal keysets immediately, connect the power that corresponds the fan subsystem, allow the experimenter to begin to carry out the experiment.
3. Experimenters design control algorithms on a network experiment platform, simulate the control algorithms, compile and generate corresponding controller codes, and download the controller codes into corresponding controllers for operation. The controller transmits the control quantity calculated by the algorithm to the fan experimental device according to a preset protocol. The main control board in the fan experimental device firstly checks after receiving the data, if the check is correct, the driving voltage at two ends of the fan is changed according to the value of the control quantity, the rotating speed of the fan is adjusted, the rotating speed of the fan at the current moment is collected and packaged and returned to the controller, and if the check is incorrect, the driving voltage at two ends of the fan is kept unchanged, and a corresponding error response is returned to the controller. The controller also checks the received response packet, calculates the control quantity according to the obtained rotating speed feedback, and sends the control quantity to the actuator terminal for cyclic reciprocation.
4. Meanwhile, as each fan is provided with the camera and the digital tube, experimenters can establish corresponding monitoring configuration on a network experiment platform, monitor the real-time running state of the fan on line, observe the real-time rotating speed of the fan, and enhance the immersion and experience.
5. After the experiment, release experimenter's control right, this fan equipment is changed into idle state by busy state, and the platform can send the disconnection power instruction to the fan experimental box that corresponds, and the main control board will control the disconnection of the relay normally open contact on the signal keysets after receiving the instruction, breaks off the power that corresponds the fan subsystem promptly to reduce the average power of experimental box operation, realize the unmanned management and control of full flow.
The invention creatively realizes the following functions:
networked control
The invention realizes high integration and modularization, has only two interfaces for the outside, namely a 220V power input interface and an Ethernet communication interface, is plug and play, and is compatible with various controllers supporting network transmission. The manager can perform online access through a remote laboratory by setting a network address for the fan device, and transmit control and sampling signals and audio and video data streams by using a network. By configuring different IP addresses for each experimental device, laboratory personnel can easily deploy laboratories of various scales from tens of laboratories to thousands of laboratories, and the construction requirements of different laboratories are fully met.
Two-edge cloud combined control
The invention is based on the control idea of combining edge cloud, each set of experiment box comprises four fan experiment devices, each device can be controlled independently, and can also be controlled cooperatively among a plurality of fan devices, thereby being suitable for the experiment requirements of different experimenters. Experimenters can design a control algorithm according to experimental purposes and select a corresponding hardware controller to carry out algorithm verification. In the experiment, experimenters can select a server with stronger performance as a cloud controller according to performance requirements, or adopt edge computing equipment with weaker performance and huge quantity as a distributed controller, and only a specified communication protocol is used for transmitting control instructions and sampling data, so that the real-time requirement of a control algorithm is met.
Design idea of low power consumption
In steady operation, the power consumption of a single set of experimental apparatus is about 10W. As hundreds of sets of fan experimental equipment are required to be deployed in a laboratory at the same time and are provided for students and researchers from related professionals in schools and even related professionals in China to use, the power consumption of a large amount of equipment in simultaneous operation is rapidly increased to reach the kW level. On the other hand, in combination with the application of the experimental course, the laboratory needs to deploy other types of devices in a large scale for students to verify different algorithms, and when all the devices are operated simultaneously, a large amount of power is consumed, which is a great challenge to the power supply of the laboratory. However, according to the background monitoring data, the number of people using most experimental devices and the time period of use are mainly concentrated in the course, that is, the experimental devices are in the idle state most of the time, and the significance that the experimental equipment runs all the time in the idle state is not great. In off-line laboratories, as part of the laboratory specification, students need to disconnect the power to all laboratory instruments when they leave, so long-term idle running conditions do not occur. However, the biggest difference between the online laboratory and the offline laboratory is that the laboratory personnel cannot directly contact the experimental equipment, so that the power supply of the experimental equipment cannot be connected or disconnected by themselves. As equipment for one-class online experiments, if a power supply is manually connected and disconnected by only depending on management personnel, a large amount of time and manpower are consumed for monitoring and management, large-scale deployment is not facilitated, and popularization to various colleges and universities all over the world is also not facilitated. Therefore, in order to improve the management level of a laboratory, the experimental device dynamically controls the power supply by using the relay, the power supply of the fan, the camera and the nixie tube is started only when a user uses the experimental device, and the power supply is automatically cut off in idle time, so that the average power consumption of the whole fan experimental device is reduced, the influence on other experimental equipment is reduced as much as possible, and energy conservation and emission reduction are realized.
Fourth, debugging and configuration interface
In order to enhance the reusability of the program, the invention also configures the serial communication module to modify the parameters of the module on line, the modifiable device parameters comprise the IP address of the device, the monitoring port number, the sampling time and the like, the experimental requirements of different control algorithms are met, and a manager can realize the large-scale deployment of the fan experimental device by configuring different IP addresses for each fan experimental device.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (7)
1. The utility model provides an online experimental apparatus of fan speed control based on networked control which characterized in that, includes the experimental box, sets up the main control board in the experimental box, is connected and a plurality of digital display screen, the power supply module who supplies power for experimental apparatus, a plurality of fans, switch, a plurality of camera and the signal keysets of being connected with the main control board through communication module and main control board.
2. The online experimental device for controlling fan speed based on networked control as claimed in claim 1, wherein the power supply assembly comprises a 12V switching power supply and a 5V power supply, the 5V power supply is used for supplying power to the fan, and the 12V switching power supply is used for supplying power to other devices except the fan; the camera and the digital display screen are respectively connected with a 12V switch power supply through a relay board.
3. The online experimental device for controlling the fan speed based on the networked control as claimed in claim 1, wherein the communication module is an RS485 module, and the digital display screen is connected with the main control panel through the RS485 module.
4. An experimental method of an online experimental device for controlling fan speed based on networked control is characterized by comprising the following steps:
step 1, a laboratory manager powers on all experimental devices, connects with a network, and allocates an IP address and a port number to each experimental device through a communication module, so that a controller running a control algorithm can normally communicate with an experimental box;
step 2, experimenters log in a network experiment platform through a switch and apply for the control right of an idle fan to carry out experiments; after receiving the control right application request, the platform allocates idle fans to experimenters and sends connection instructions to corresponding fan experiment boxes, and after receiving the instructions, the main control board immediately drives the normally open contacts of the relays on the control signal adapter board to be closed to connect with the power supplies of corresponding fan subsystems, so that the experimenters are allowed to start experiments;
step 3, the experimenter designs a control algorithm on a network experiment platform of the switch, simulates, compiles and generates a corresponding controller code, and downloads the controller code into a corresponding controller for operation; the controller transmits the control quantity obtained by the algorithm calculation to the fan experimental device according to a preset protocol; the main control board in the fan experimental device firstly checks after receiving the data, if the check is correct, the driving voltage at the two ends of the fan is changed according to the value of the control quantity, the rotating speed of the fan is adjusted, the rotating speed of the fan at the current moment is collected and packaged into a response packet to be returned to the controller, and if the check is incorrect, the driving voltage at the two ends of the fan is kept unchanged, and a corresponding error response is returned to the controller; meanwhile, the controller checks the received response packet, if the response packet is correct, the controller calculates the control quantity according to the obtained rotating speed feedback and sends the control quantity to the actuator terminal, and if the response packet is wrong, the controller checks the received response packet; (ii) a (ii) a Discarding the current response packet, and re-receiving a new response packet, and repeating the steps;
and 5, after the experiment is finished, the control right of experimenters is released, the fan equipment is changed from a busy state to an idle state, the platform sends a power supply disconnection instruction to the corresponding fan experimental box, and the main control board controls a relay normally-open contact on the signal adapter board to be disconnected after receiving the instruction, namely, the power supply of the corresponding fan subsystem is disconnected, so that the average power of the operation of the experimental box is reduced, and the full-flow unmanned control is realized.
5. The experimental method of fan speed control online experimental device based on networked control as claimed in claim 4, wherein experimenters can establish corresponding monitoring configuration on a network experimental platform, monitor the real-time running state of the fan on line through a camera and a digital display screen corresponding to each fan, observe the real-time rotating speed of the fan, and display the real-time rotating speed of the fan on the digital display screen.
6. The experimental method of the online experimental device for fan speed control based on networked control as claimed in claim 4, wherein in step 3, the specific method for verification is:
the method comprises the steps that a check code mechanism is adopted to check data frames, each data frame comprises three parts, namely a frame head, effective data and a frame tail, the frame head adopts a fixed byte sequence, an effective data section comprises a data length, a time stamp and data content, and the frame tail is a CRC check code of the effective data section; each check comprises three parts, namely frame head check, data length check and frame tail CRC check, and only when the three parts of checks pass, the current data packet is valid and is analyzed.
7. The experimental method of the online experimental device for fan speed control based on networked control as claimed in claim 4, wherein in step 3, the specific method for calculating the control quantity according to the obtained rotation speed feedback is:
the controller makes a difference according to the real-time rotating speed and the set rotating speed of the fan to obtain the real-time rotating speed difference of the fan, a proportional control component is obtained by calculation after the real-time rotating speed difference is multiplied by a certain proportional coefficient, the historical rotating speed difference of the fan is accumulated and summed, an integral control component is obtained after the historical rotating speed difference is multiplied by an integral coefficient, and the proportional control component and the integral control component are combined to obtain the final control quantity.
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