Adaptive digital controller with automatic plant tuning

Boots – shoes – and leggings

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Details

364159, 364161, 364162, G05B 1302, G05B 2302, G05B 1142

Patent

active

054064961

ABSTRACT:
The present invention is a method and an apparatus for automatically tuning a plant. The method includes the steps of applying a plurality of sinusoidal signals to the plant, and measuring the frequency response of the plant to the plurality of sinusoidal signals to detect frequencies at which the plant is resonant. The coefficients of at least one digital filter are calculated such that the at least one filter when combined with the plant suppresses the detected resonances. The method further includes applying at least one sinusoidal signal having a frequency substantially equal to a crossover frequency of the system to the at least one filter and plant, and measuring the frequency response to calculate the magnitude and phase response of the filters and plant at that frequency. The coefficients of the compensator are calculated such that when combined with the plant and the at least one filter the combination provides a response which yields said predetermined system response. An apparatus to substantially perform the method as described is also disclosed.

REFERENCES:
patent: 4602326 (1986-07-01), Kraus
patent: 4754391 (1988-06-01), Suzuki
patent: 4855674 (1989-08-01), Murate et al.
patent: 4903192 (1990-02-01), Saito et al.
patent: 5155422 (1992-10-01), Sidman et al.
patent: 5268625 (1993-12-01), Plummer
Yang et al., "An Approach to Automatic Tuning of Phase-Lead and Phase-Lag Compensators" Decision and Control, 1991 30th Annual Conference pp. 2944-2945.
European Patent Application No. 360,206 A2, Saito et al. (Mar. 28, 1990).
Digital Signal Processing Applications With The TMS320 Family, Texas Instruments, pp. 701-707 (date unknown).
Adaptive Control Algorithum Self-Tunes Industrial Servo, S. Goodnick et al., PCIM, pp. 26-32 (Sep., 1989).

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