Adaptive Control Unit Feedback Compensation
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Solution Overview
Problem
Existing active control systems face challenges with feedback coupling between the output and input, leading to instability and pollution of reference signals, particularly in virtual earth and feed forward control systems, which limits their adaptability and effectiveness.
Innovation Solution
An adaptive control system with an analog filter and adjustable gain, utilizing feedback compensation through filtering means that reconstructs the reference signal by subtracting the feedback component from the input signal, allowing for adaptive gain control and stable feed forward control methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If virtual earth feedback control systems are used to detect parameters close to the control point, then the control system can drive the parameter to a desirable value, but stability of the feedback loop deteriorates due to coupling between output and input signals
Solution Approach 1:
The patent extracts the harmful feedback component from the reference signal by using a model of the feedback path to generate and subtract the coupled signal. This separation allows the genuine reference signal to be processed without instability while maintaining accurate parameter detection.
Solution Approach 2:
The patent introduces a feedback path model as an intermediary element that characterizes the coupling between output and input. This model acts as a mediator to predict and remove the feedback component, enabling stable processing of the reference signal while preserving detection accuracy.
2Productivity
If feed forward control systems are used with a reference signal indicative of the parameter to be controlled, then the control system can achieve desired control, but the reference signal becomes polluted by the output control signal
Solution Approach 1:
The patent extracts the polluted feedback component from the reference signal using a feedback path model. By generating a model output based on the control signal and subtracting it from the contaminated reference signal, the genuine reference information is recovered for effective feed forward control.
Solution Approach 2:
The patent uses feedback principles by modeling the feedback path and using the control signal to generate an estimate of the polluted component. This estimated feedback is then subtracted from the reference signal, effectively cleaning it while maintaining control effectiveness.
3Speed
If digital control systems are used to overcome latency problems, then processing speed can be increased, but system complexity and cost increase
Solution Approach 1:
The patent segments the control system into distinct functional blocks: a feedback path model for signal processing, a reference signal reconstruction unit, and a control output unit. This modular segmentation allows efficient processing while maintaining manageable system complexity.
Data Source
AI summary
An adaptive control unit is described for receiving an analog input signal containing at least an indication of a parameter to be controlled to generate an analog output signal for control of the parameter. The analog input signal contains a fed back component resulting from the analog output signal. The adaptive control unit comprises an analog filter having an adjustable gain, a gain adjuster for adjusting the gain of the analog filter using a feedforward adjustment method, and a filter for compensating for the fed back component in the analog input signal.