Automatic control principle and computer control experiment system

ZN-08E Automatic Control Principle and Computer Control Experimental System
1. Overview The
study of automatic control principle is a basic course in the professional teaching of automation, automatic control, electronic technology, electrical technology, and precision instruments. The system provides integrated operating software. Through the virtual PC oscilloscope function, various static and dynamic characteristics of the control system can be observed in real time and clearly, which facilitates the study of the characteristics of the analog control system. The miniature temperature control unit can replace the oven to carry out temperature control experiments, plus the control objects such as the DC motor and stepper motor of the system configuration, the experiment of the control system course can be set up. The system can also be extended to support simulation experiments of modern control theories such as linear systems, optimal control, system identification and computer control.
2. Features:
1. The high-performance embedded control computer
system uses Intel 8088 as the control computer of the system. Intel 8088 is a 16-bit processor introduced by INTEL. It is designed and developed for embedded industrial applications. It has many common interfaces such as 8259 and 8253. , Serial port and other chips can be used together, and the program and data memory can be expanded to meet the requirements of complex computer control and application. So that computer-controlled experimental teaching can reach a higher level.
2. Open control experiment platform The
experiment platform has various typical signal sources (step signal, square wave signal, ramp signal, parabolic wave signal, sine wave signal), simulation object (eight groups of operational amplifier units), actual Objects (stepping motors, DC motors, temperature control) and other units. The circuit connection between the units and the selection of the components in the unit can be operated in a variety of ways, which greatly improves the efficiency of the experiment. The system allows users to design and develop corresponding experimental projects according to the teaching content, and supports large-scale curriculum design and graduation design.
3. The advanced virtual instrument function
system provides a set of advanced virtual instrument functions, creating an integrated experimental environment for users that integrates control system design, circuit construction, system debugging, and test analysis. It has a very high cost performance and excellent performance. Teaching effect. Its main performance indicators are as follows:
(1) Dual-track ultra-low frequency digital storage oscilloscope: It has the functions of real-time measurement and display, waveform playback, cursor measurement, and waveform storage.
(2) Frequency characteristic analyzer: It can display and analyze the corresponding waveforms in the time domain of each frequency point of the system. It can be measured in a semi-automatic sweep frequency measurement mode. After the measurement is completed, the polar coordinate graph and the Bode graph can be generated, which shows The frequency characteristic of the system also has the function of saving graphics.
(3) X_Y measurement: Display the two measurement signals in the form of X_Y coordinates, with waveform refresh and waveform storage functions, which can be applied to the experimental characteristics of nonlinear systems.
4. Source language-level integrated development environment The
system is an embedded control computer equipped with a highly visualized source language-level integrated development environment, which integrates control program development, debugging, and experimental measurement analysis, and supports assembly source language-level programming and debugging.
5. New type of control experiment teaching content
The control experiment supported by the system is equipped with the new automatic control and computer control teaching system and content of the 21st century, and its content ranges from shallow to deep, with clear levels.
In terms of automatic control principle experiments, the system provides experimental research including time domain analysis method, root locus analysis method, frequency domain analysis method and system calibration and design methods of linear control system. It also provides information about linear discrete systems and nonlinear control. Systematic experimental research content; In addition, state-space analysis experiments are provided for the teaching of modern control theory.
The computer control experiment content provided by the system mainly includes: process channel and data acquisition and processing, digital program control of the system, digital PID closed-loop control, experimental research on the direct design method of digital regulator, so that students can understand the new intelligent control algorithm. And master. In terms of control system application experiments, the system provides two experimental objects of DC motor (fast) and temperature control (slow) to form different closed-loop systems, so that different control strategies or control parameters can be selected to obtain the best Real-time control effect.
3. System composition
(1) The system is composed of each unit circuit, 8088CPU control unit and the serial port of PC for communication;
(2) Signal source generating unit circuit: sine wave, square wave, ramp wave and parabolic wave, the signal period is adjustable from 2 milliseconds to 30 seconds;
(3) Sampling protector and monostable unit circuit;
(4) Operation Analog unit circuit;
(5) Non-linear unit circuit;
(6) Status indicator unit;
(7) D/A0832 digital/analog conversion unit circuit;
(8) A/D0809 analog/digital conversion unit circuit;
(9) Single Beat pulse generating unit;
(10) Potentiometer unit;
(11)-5V power generating unit;
(12) Drive unit;
(13) Motor unit;
(14) DC motor, stepper motor module unit;
(15) Signal measurement Unit: PC software is used to realize functions such as dual trace oscilloscope and frequency characteristic analysis.
(16) Special operation link unit;
(17) Variable resistor group unit;
(18) Micro temperature control unit;
4. Power supply parameters
1. Input voltage: 220V ±10%
2. Output voltage/current: +5V/2A , +l2V/0.2A, -l2V/0.2A
experimental project
(1) Automatic control principle experimental project
1. Simulation study of typical links
2. Transient response and stability of typical system
3. System calibration
4. Frequency characteristics of control system
5. Typical nonlinear link
6. Non-linear system (1)
7. Non-linear system (2)
8. Sampling system analysis
9. Correction of sampling control system
10. State feedback (pole configuration)
(2) Computer control technology
1. A/D, D/A conversion
2. Sample holder
3. Digital filter
4. Integral separate PID control
5. Small Beat with ripple system experiment
6, Xiaopai without ripple system experiment
7, Dalin algorithm control
8, nonlinear control
9, decoupling control
10, comprehensive control experiment
(three) control system application
1. DC motor closed loop speed regulation experiment
2 .Temperature closed-loop control experiment
3. Stepper motor speed control experiment