1. Information processing. For complex control systems, the input signal and the calculation of the error according to the requirements of the control algorithm are very computationally intensive, and the analog solution is not used to achieve the required accuracy, which requires computer processing.
2. Real-time control. The computer control system is controlled by a software program and continuously calibrates the system to achieve the desired dynamic characteristics.
3. Complex calculations. The computer has the function of quickly implementing complex calculations, thus enabling advanced control functions such as optimal control and adaptive control of the system and multi-function calculation adjustment.
The control process of the digital control system can be divided into three parts:
1. Collect data in real time. The controlled parameters of the controlled object are detected in real time and transmitted to the computer for processing.
2. Real-time decision making. The state quantity of the collected controlled parameters is analyzed, and the control quantity is calculated according to a certain control algorithm to determine the next control process.
3. Real-time control. A control signal is sent to the actuator in real time based on the decision.
“Real time” means that the input, calculation and output of the signal are completed within the sampling interval. This control function of the computer control system is continuously repeated, so that the entire system can work according to certain dynamic quality indicators, and the entire control system can reach the required performance index; and the abnormal state of the controlled parameters and the device itself Ability to monitor and process.