Boots – shoes – and leggings
Patent
1991-06-12
1992-10-06
Smith, Jerry
Boots, shoes, and leggings
364157, 364158, 364162, G05B 1302
Patent
active
051538075
ABSTRACT:
A self-tuning controller apparatus which comprises: a control response pattern recognition portion for receiving a set-point and a controlled variable of a process and for obtaining three performance indexes from a controlled variable response pattern generated in response to a change in the set-point or a disturbance; a control parameter correction portion for qualitatively evaluating the three performance indexes and for inferring a correction value of a PID control parameter on the basis of the result of evaluation; and a control performance dissatisfaction degree evaluation portion for evaluating the inferred correction value of the PID control parameter in accordance with the dissatisfaction degrees of the two performance indexes for the respective target specifications of the two of the three performance indexes. The control performance dissatisfaction degree evaluation portion acts to make the PID control parameter converge stably. In a process control system including a plurality of vertically distributed control elements each capable of self-tuning its control parameter, the control performance dissatisfaction degree evaluation portion contributes to autonomous functioning of each of the control elements.
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Hitachi Review, "A Single Loop Controller with Auto-Tuning System Using the Expert Method"; vol. 36, No. 6, 1987; K. Tachibana et al.
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Kawakami Junzo
Saito Tadayoshi
Tachibana Kouji
Takahashi Susumu
Yokokawa Nobuyuki
Gordon Paul
Hitachi , Ltd.
Smith Jerry
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