The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 1979
Filed:
Feb. 03, 1978
Charles W Ross, Hatboro, PA (US);
Leeds & Northrup Company, North Wales, PA (US);
Abstract
Two controllers in a cascade control system are decoupled to avoid interaction by modifying the error signal to the primary controller in response to changes in the error signal to the secondary controller. The response is developed by a network which models the primary process. A signal developed from the output of the primary controller is fed forward to modify the manipulated variable. The modifying network is a model of the reciprocal of the dynamics of the secondary process. Also, the adjustment performed by the primary controller on the set point of the secondary controller is delayed in accordance with the product of the secondary process model and the reciprocal feedforward model.