Dual Feedback Control for Carriage Velocity Vibration Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional feedback control methods for stabilizing the velocity vibration of a carriage in serial type printers often compromise responsiveness, leading to compatibility issues between traceability and vibration suppression.
Innovation Solution
An electric apparatus and control method that utilize dual feedback control loops, where a first loop performs conventional PID control for stable movement and a second loop, with shorter control periods, suppresses micro-velocity vibrations by generating operation quantities based on state quantities derived from position, velocity, and acceleration, ensuring compatibility between traceability and vibration suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the control gain is decreased to suppress excessive velocity vibration, then vibration suppression is improved, but the responsiveness of the control target object deteriorates
Solution Approach 1:
The control system is divided into two separate feedback control loops: a first feedback control loop for traceability control and a second feedback control loop for vibration suppression control. Each loop operates with different control gains and periods, allowing independent optimization of responsiveness and vibration suppression without mutual interference.
Solution Approach 2:
The invention introduces a new control dimension by adding the second feedback control loop that operates in parallel with the first loop. This multi-dimensional control approach enables simultaneous achievement of traceability (first loop) and vibration suppression (second loop) by controlling different aspects of the system behavior independently.
2Measurement precision
If conventional PID control is used for carriage movement, then traceability is maintained, but high-frequency velocity vibrations cannot be effectively suppressed
Solution Approach 1:
The control system separates traceability control and vibration suppression into two distinct feedback loops. The first loop maintains traceability with appropriate control gain, while the second loop specifically targets high-frequency vibrations with a shorter control period and differentiated state quantities.
Solution Approach 2:
The second feedback control loop dynamically adjusts control based on the relationship between state quantities and their time derivatives, enabling adaptive suppression of high-frequency vibrations. The control period of the second loop is shorter than the first loop, allowing dynamic response to rapid velocity changes.
Data Source
AI summary
An apparatus detects movement of a target object, estimates a control quantity for first feedback control for the target object at a first period based on a detection signal, estimates a first state quantity of the target object and a second state quantity obtained by time differentiation of the first state quantity for second feedback control for the target object at a second period, shorter than the first period, based on the detection signal, generates a first operation quantity for the first feedback control based on the control quantity, generates a second operation quantity for the second feedback control based on the first and second state quantities, determines a sign of the second operation quantity from a relationship between the first and second state quantities, and generates an operation quantity on the target object from the first and second operation quantities.