Control System Switching Between PDFF and PI Modes
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Solution Overview
Problem
Conventional PI and PID control methods for servo motors face challenges in adapting to environmental and temporal changes, resulting in robustness issues and an inability to balance response speed and overshooting, leading to suboptimal performance.
Innovation Solution
A control system comprising a first operational element, feedback proportion controller, integrator, and second operational element, which can automatically switch between different control methods such as PDFF, PI, PDF, and P by selectively using various gains to generate output signals, allowing for high-efficiency control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the response speed of the system is increased, then the response speed is improved, but overshooting occurs to reduce precision of the system
Solution Approach 1:
The patent implements dynamic switching between different control modes (PI control and PDFF control) based on real-time system state. The controller automatically transitions between control algorithms depending on whether the system is in acceleration, deceleration, or steady-state phases, allowing optimal response speed without excessive overshooting.
Solution Approach 2:
The patent changes control parameters dynamically by switching between different control modes. The PI controller parameters (Kp, Ki) and PDFF controller parameters (Kp, Kd) are selectively activated based on system conditions, enabling the system to achieve fast response when needed while maintaining precision during critical phases.
2Device complexity
If the PI control or PID control only uses a single parameter, then the control structure is simple, but it is difficult for the control manner to adapt to the change of the system with the time or environment, resulting in a robustness problem
Solution Approach 1:
The patent creates a universal controller that can function in multiple control modes (PI and PDFF) within a single control structure. This multi-functional controller adapts to different system conditions and environmental changes, providing robustness while maintaining relatively simple overall architecture through shared operational elements.
Solution Approach 2:
The controller dynamically adapts to system changes by automatically switching between control modes based on real-time feedback. This dynamic adaptability allows the system to respond effectively to environmental changes and system variations without requiring complex reconfiguration.
3Ease of manufacture
If the conventional PI control or PID control is used, then the control method is conventional and simple to implement, but the system can neither be adjusted according to the change of environment or time, nor obtain an appropriate balance point between the response speed and the overshooting of the system
Solution Approach 1:
The patent implements dynamic mode switching between PI and PDFF control based on system state, enabling automatic adaptation to environmental and temporal changes. The controller transitions between control algorithms during different operational phases, achieving both ease of implementation and high adaptability.
Solution Approach 2:
The system uses feedback signals to determine when to switch between control modes. The feedback mechanism monitors system performance and automatically adjusts the control strategy, providing adaptability while maintaining a relatively simple implementation through rule-based switching.
Data Source
AI summary
A control system may be switched between a Pseudo-Derivative Feedforward (PDFF) control manner and a Proportional Integral (PI) control manner. The control system includes a first operational element, a second operational element, a feedback proportion controller, an integrator, and a feedforward proportion controller. The first operational element and the second operational element are used to perform calculation of addition or subtraction on an input signal, a feedback signal, and a feedforward signal. The integrator generates an integral signal. The feedback proportion controller generates a feedback proportion signal according to a first feedback gain or a second feedback gain. The feedforward proportion controller generates a feedforward proportion signal according to a first feedforward gain or a second feedforward gain. The control system may be switched among the different control manners through selection among the first feedback gain, the second feedback gain, the first feedforward gain, and the second feedforward gain.