Dead-Time Timing Prediction for Disturbance Suppression Control
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Solution Overview
Problem
Control systems with dead time struggle to immediately respond to manipulated variables, leading to delayed output changes, making it difficult to effectively suppress disturbances.
Innovation Solution
A disturbance suppression apparatus that includes a PID controller, a disturbance manipulated variable prediction unit, and a timing prediction device. The timing prediction device acquires dead time and disturbance start time to predict the optimal timing for applying the disturbance manipulated variable to the PID manipulated variable, considering the dead time, thereby canceling the disturbance effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a disturbance manipulated variable is applied to cancel a disturbance in a control system with dead time, then the disturbance influence can be suppressed, but the application timing becomes difficult to determine accurately due to the dead time delay
Solution Approach 1:
The timing prediction device predicts the optimal application timing for the disturbance manipulated variable in advance by calculating based on the dead time L and disturbance start time B. This preliminary determination of timing allows the disturbance compensation to be applied at the correct moment, resolving the timing uncertainty caused by dead time delays in the control system.
2Device complexity
If the disturbance manipulated variable application timing is determined without considering dead time, then the control system is simpler, but the disturbance suppression becomes inappropriate and less effective
Solution Approach 1:
The timing prediction device acts as an intermediary component that bridges the disturbance manipulated variable prediction unit and the manipulated variable application unit. It calculates the optimal application timing by adding the dead time L to the disturbance start time B, thereby mediating the timing information to ensure accurate disturbance suppression without overly complicating the overall control system architecture.
3Measurement precision
If the dead time is compensated for in disturbance suppression, then the control accuracy improves, but the disturbance start time must be detected precisely which increases system complexity
Solution Approach 1:
The system performs preliminary detection and recording of the disturbance start time B when the disturbance occurs, storing this timing information for later use. By capturing the disturbance start time in advance and using it in the timing prediction calculation (B + L), the system achieves precise disturbance suppression without requiring continuous complex monitoring during the control process.
Data Source
AI summary
A disturbance suppression apparatus includes a timing prediction device. The timing prediction device includes a dead time acquisition unit, a disturbance start time acquisition unit, and a timing prediction unit. The dead time acquisition unit performs PID tuning to acquire a dead time. The disturbance start time acquisition unit acquires a disturbance start time representing a period from a time point at which a start signal is input to a time point at which a temperature starts to be affected by a disturbance. The timing prediction unit predicts a disturbance manipulated variable application timing on the basis of the dead time and the disturbance start time.