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. 09, 1979
Filed:
Apr. 14, 1977
William E Zitelli, Monroeville Borough, PA (US);
James M Mussler, Bethel Park, PA (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
A microprocessor-based control system for controlling the speed of a steam turbine by governing the steam supplied thereto from a steam supply source using one or more hydraulically operated servomotor throttle valves is disclosed. The operation of the speed controller is characterized by a plurality of permanently pre-programmed read-only memories containing sets of instructions and data words arranged in an addressable order. The instructions and data words are synchronously processed by the microprocessor as governed by a system clock. Apparatus is provided to initialize the status of the speed controller under the control of the microprocessor in accordance with the processing of one portion of the sets of programmed instructions and data words thereby. The remaining portion of the program is processed by the microprocessor as governed by a real time clock for coordinating the operation of an operator's panel interfaced to the controller and for monitoring the turbine speed and controlling the position of the one or more valve servomotors in accordance therewith. The subportion of the remaining portion of the program primarily characterizing the panel coordination functions is processed during each even period of the real time clock. Accordingly, the subportion of the remaining portion of the program primarily characterizing the turbine speed control is processed during the odd periods of the real time clock.