Selectable feedback control system
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United States of America Patent
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Sep 5, 1995
Grant Date -
N/A
app pub date -
May 7, 1993
filing date -
May 8, 1992
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A control system includes a first estimation section for estimating a first state variable of a plant object such as a semiconductor wafer temperature control arrangement on the basis of a control input supplied to the plant object and an output from the plant object, a second estimation section for estimating a second state variable of the plant object on the basis of the control input alone, a switching section for selecting one of the first and second estimation sections, and a servo section for adjusting the control input by feeding back the state variable from the first or second estimation section to an input section of the plant object.
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