PI Controller Setpoint Weighting for Servo Response Tuning
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Solution Overview
Problem
Conventional methods for setting proportional integral-type correctors with setpoint weighting in servo-controlled systems are tedious and lack automation, often resulting in suboptimal performance in terms of overshoot, response time, stability, and robustness, especially when dealing with ramp-type setpoints and measurement noise.
Innovation Solution
An automated method for setting a proportional integral-type corrector with setpoint weighting, involving steps to set the setpoint weighting coefficient based on predefined performance criteria, using a unit value for initial setup, optimizing proportional and integral gains, and defining the setpoint weighting coefficient according to the characteristic tracking error and gains, without incorporating a derivative component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If iterative heuristic method is used to set PI corrector with setpoint weighting, then the corrector can be configured, but the setting process becomes tedious and time-consuming
Solution Approach 1:
The patent transforms the iterative heuristic parameter tuning process into a direct analytical calculation by changing the parameter determination method from empirical iteration to formula-based computation using system characteristics ( poles, zeros, gain margin)
Solution Approach 2:
The patent replaces the manual iterative adjustment mechanism with an automated computational approach using processor-based calculation of the setpoint weighting coefficient based on system model parameters
2Device complexity
If conventional PI corrector is used, then the structure is simple, but it cannot meet severe performance requirements for response time, overshoot, and stability
Solution Approach 1:
The patent segments the control function by introducing a separate setpoint weighting coefficient that independently adjusts tracking dynamics, separating it from the proportional and integral gains that handle stability and disturbance rejection
Solution Approach 2:
The patent makes the corrector adaptable by introducing a tunable setpoint weighting coefficient that can be adjusted based on specific performance requirements, allowing the same PI structure to meet varying performance criteria
3Speed
If derivative component is added to improve response performance, then the response time improves, but measurement noise and abrupt setpoint variations generate unwanted effects
Solution Approach 1:
The patent extracts the setpoint weighting function from the derivative term, achieving fast response through setpoint weighting while eliminating the need for derivative action that amplifies noise and abrupt variations
4Stability of the object's composition
If setpoint weighting coefficient is optimized to minimize overshoot, then overshoot is reduced, but response time may be degraded
Solution Approach 1:
The patent uses analytical parameter relationships to determine the optimal setpoint weighting coefficient that achieves the desired overshoot/response time compromise based on system characteristics rather than trial and error
Data Source
AI summary
The invention relates to a method for the closed-loop control of a proportional integral-type controller (2) in an instrumentation and control device (1) of a closed-loop control system (3), in particular a servovalve-actuator system, said controller (2) including a setpoint-weighting coefficient (β), said closed-loop control method comprising the consecutive steps of assigning (11) a unit value to the set-point weighting coefficient (β), optimizing (12) a closed-loop control of the controller (2) satisfying at least one predefined performance criterion, defining a characteristic tracking error (εTC) making it possible to respond to the performance constraints of the system to be closed-loop controlled, and assigning (132) a setpoint weighting coefficient (β) value, depending on the characteristic tracking error (εTC) and the closed-loop control of the controller (2).