Control Device Design for Balancing Set Point and Disturbance Response
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Solution Overview
Problem
Current control systems, such as model reference adaptive control and PID control, face challenges in balancing set point response and disturbance response, requiring complex design processes and expertise in state-space representation, making them difficult to implement in industrial settings.
Innovation Solution
A method for designing a control device that includes a feedback controller and a disturbance feedback system, allowing for the selection of nominal plant transfer functions based on plant characteristics and determining feedback controller transfer functions, enabling easy balancing of set point and disturbance responses without state-space representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If model reference adaptive control with disturbance observer and sliding mode controller is used, then disturbance response is improved, but device complexity and design difficulty increase due to state-space representation requirements
Solution Approach 1:
The patent extracts the disturbance compensation function from the complex model reference adaptive control system and implements it separately using a disturbance observer with transfer function representation. This separates the disturbance handling mechanism from the main control loop, reducing overall system design complexity while maintaining disturbance rejection capability
Solution Approach 2:
The patent replaces the state-space representation approach with transfer function representation. This substitution changes the mathematical framework from state variables and matrices to input-output relationships, making the system more accessible to engineers without specialized knowledge in modern control theory
2Reliability
If PID parameters are tuned to balance set point response and disturbance response, then control performance is improved, but loss of time increases due to trial and error tuning of three parameters
Solution Approach 1:
The patent extracts the disturbance compensation function into a separate disturbance observer module, allowing independent optimization of set point response (via feedback controller) and disturbance response (via disturbance observer). This separation eliminates the trade-off relationship that requires time-consuming parameter tuning in traditional PID control
Solution Approach 2:
The patent introduces a disturbance observer as an intermediary component that estimates and compensates for disturbances independently. This mediator allows the system to achieve both good set point response and disturbance rejection without requiring extensive parameter tuning, as the disturbance observer handles disturbance compensation separately from the main feedback control
Data Source
AI summary
A method of designing a control device that controls a controlled variable of a plant to a set point, the control device including a feedback control system for outputting a manipulated variable of the plant based on an output of a feedback controller and a disturbance estimation value, including a step of selecting one of a first order transfer function, a second order transfer function, a third order transfer function, a first order and time delay transfer function, a second order and time delay transfer function, and a third order and time delay transfer function as a transfer function of the nominal plant in accordance with characteristics of the plant; and a step of determining a transfer function of the feedback controller based on a gain and time constant of the nominal plant.