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:
Jan. 12, 1988
Filed:
Jul. 08, 1985
Takashi Shigemasa, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A process control apparatus comprises a main controller having a first integrator for integrating a difference signal between a set point and an output of a process and a PD (proportional-derivative) arithmetic operating unit for executing the PD arithmetic operation for the output of the process. The main controller obtains a control signal on the basis of an I-PD (integral-poroportional-derivative) control method and supplying this control signal to the process. A robust controller, connected to the output of the process, comprises a high-order differentiator for high-order differentiating the output of the process, a second integrator for integrating the difference signal between the set point and the output of the process, a subtractor for subtracting an output of the second integrator from an output of the high-order differentiator, and an amplifier for amplifying an output of the subtractor and feeding back this amplified output to the control signal.