Method and apparatus for digital position control

Details Method and apparatus for digital position control Method and apparatus for digital position control

1997-09-10

1998-12-08

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Adaptive or optimizing systems including 'bang-bang' servos

318560, 318632, 318434, G05B 1300

Patent

active

058475273

ABSTRACT:
A digital position control system having a model of a plant therein is applied to a head position control system for a HDD in which a head moving unit is made to be a plant. A CPU of the HDD performs bang--bang control of the model to control movement of the head, and performs model following control to cause the head moving unit to follow the control of the model. Moreover, the CPU determines all of control input values attributable to dead beat control are smaller than an input limit value in a state of a deceleration state caused by the bang--bang control. When all of control input values are smaller than the input limit value of the plant, the CPU performs switching control to switch the bang--bang control to the dead beat control.

REFERENCES:
patent: 4405956 (1983-09-01), Marshall
patent: 4638230 (1987-01-01), Lee
patent: 5369345 (1994-11-01), Phan et al.
patent: 5465183 (1995-11-01), Hattori
patent: 5469414 (1995-11-01), Okamura
patent: 5691617 (1997-11-01), Funches

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