Method of optimal scaling of variables in a multivariable predic

Details Method of optimal scaling of variables in a multivariable predic Method of optimal scaling of variables in a multivariable predic

1995-04-03

1996-11-12

Envall, Jr., Roy N.

Boots, shoes, and leggings

364153, 364157, G05B 1302

Patent

active

055746381

ABSTRACT:
A process control system which includes at least one manipulated variable and at least one controlled variable, provides a method for robust control of a process. Predetermined constraints of the manipulated variables and the controlled variables, and the present values of the manipulated variables are obtained. A set of scale factors for the manipulated variables and the process variables are calculated. The controller is initialized with the set of scale factors, the scale factors determining the relative importance of the manipulated variables and the process variables to the process. New values are calculated for the controlled variables for a predetermined number of points in the future, such that the values of the controlled variables are within the predetermined range thereby obtaining an optimal robustness of the resultant controller. The manipulated variables are also calculated to be within predetermined constraints, and the controlled variables to fall within a predetermined range when controllable. From a plurality of solutions, a most robust solution is selected. Then the manipulated variables are adjusted to cause the process control system to drive the values of the controlled variables to the calculated values.

REFERENCES:
patent: 5347446 (1994-09-01), Iino et al.
patent: 5351184 (1994-09-01), Lu et al.

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