Dynamic process control

Patent 4616308 Issued on October 7, 1986. Estimated Expiration Date:

December 2, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3862403

3891836

Step-control of electromechanical systems
Patent #: 4169283
Issued on: 09/25/1979
Inventor: Lewis

Dynamic matrix control method
Patent #: 4349869
Issued on: 09/14/1982
Inventor: Prett , et al.

Automatic speed control for heavy vehicles Patent #: 4374422
Issued on: 02/15/1983
Inventor: O'Keefe, Jr. , et al.

Inventors

Assignee

Shell Oil Company

Application

No. 06/803797 filed on 12/02/1985

US Classes:

700/39Test signal

Examiners

Primary: Smith, Jerry
Assistant: MacDonald, Allen R.

International Class

G05B 13/02 (20060101)

Abstract

A method of controlling a process having a plurality of independently controlled, manipulated variables and at least one controlled variable which is dependent on the manipulated variables. In the first step of the method data is gathered about the process by introducing test disturbances in the manipulated variables and measuring the effect of the disturbances on the controlled variable. The value of the controlled variable is measured at a first time. Using the data gathered from the test disturbances and the measured value of the controlled variable, a first set of changes in at least one of the manipulated variables is calculated such that the controlled variable is driven towards its set point without exceeding a predetermined limit. The manipulated variables are adjusted in accordance with at least one change from the first set of calculated changes. The values of the manipulated variables and the controlled variable are then measured at a second time. A second set of changes in at least one of the manipulated variables is calculated using the first set of changes and the measured values at the second time. This second set of changes is calculated such that the controlled variable is driven towards its set point without exceeding a predetermined limit. The manipulated variables are adjusted in accordance with at least one change from the second set of changes.