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:
Jun. 15, 1982
Filed:
Jul. 03, 1980
Applicant:
Inventor:
Hitoshi Ogasawara, Hitachi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05B / ;
U.S. Cl.
CPC ...
318624 ; 318611 ;
Abstract
An automatic control system in which a controlled quantity of an object to be controlled is compared with a preset quantity through a comparator, the output signal of which is applied to blind controller means having a dead zone set therein. When the output from the comparator comes out beyond the dead zone, the blind controller means cooperates with operation holding means to perform a control operation continuously for a predetermined time even when the output from the comparator falls within the dead zone. The number of times at which the object is controlled may be significantly decreased.