Extremum-Seeking Control With Self-Tuning Dither Frequency
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Solution Overview
Problem
Traditional extremum-seeking control (ESC) systems require manual configuration and testing to determine system parameters like bandwidth and gain, which is disruptive and assumes static conditions, lacking an automatic and non-disruptive method for system parameter determination.
Innovation Solution
A self-configuring ESC system that includes a dither signal generator, communications interface, phase delay estimator, and bandwidth estimator to automatically determine system parameters by perturbing the control input with a dither signal, estimating phase delay, and updating the dither frequency based on estimated bandwidth, enabling automatic configuration without manual testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual step test system identification procedure is performed to estimate system bandwidth, then system parameters can be determined, but system operation is disrupted and the procedure assumes bandwidth does not change after testing
Solution Approach 1:
The patent applies preliminary action by performing system identification through continuous operation rather than requiring preliminary manual testing. The automatic identification procedure determines system parameters (bandwidth, gain) while the system operates normally, eliminating the need for disruptive pre-testing and allowing parameters to be updated as conditions change.
Solution Approach 2:
The patent implements dynamics by making the system identification procedure adaptive and continuous rather than static and one-time. The automatic procedure can determine updated system parameters as conditions change over time, making the identification process dynamic rather than assuming fixed parameters after initial testing.
2Reliability
If manual configuration and testing is used to determine system parameters, then suitable values for bandwidth and gain can be selected, but the process is time-consuming and requires system disruption
Solution Approach 1:
The patent applies self-service by enabling the system to automatically determine its own parameters (bandwidth, gain) through an automatic identification procedure. The system performs self-testing and self-configuration without requiring manual intervention, thus eliminating time-consuming manual configuration while maintaining parameter accuracy through continuous automatic determination.
3Power
If dither signal frequency is selected to match system natural frequency to enhance resonance effect, then dither signal effectiveness is improved, but system bandwidth must be known in advance
Solution Approach 1:
The patent applies feedback by using the automatic system identification procedure to determine the system's natural frequency, then using this information to select the optimal dither signal frequency. The feedback loop continuously monitors system response and adjusts the dither frequency to match the natural frequency, maximizing resonance effect without requiring prior knowledge of system parameters.
Data Source
AI summary
A self-configuring extremum-seeking controller includes a dither signal generator, a communications interface, a phase delay estimator, and a bandwidth estimator. The dither signal generator identifies a stored dither frequency, generates a dither signal having the stored dither frequency, and uses the dither signal to perturb a control input for a plant. The communications interface provides the perturbed control input to the plant and receives an output signal from the plant resulting from the perturbed control input. The phase delay estimator estimates a phase delay between the output signal and the dither signal. The bandwidth estimator estimates a bandwidth of the plant based on the estimated phase delay. The dither signal generator updates the stored dither frequency based on the estimated bandwidth.