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. 26, 1982
Filed:
Oct. 23, 1979
Applicant:
Inventors:
Douglas H Clelford, Trumbull, CT (US);
Donald W Fowler, West Haven, CT (US);
Assignee:
United Technologies Corporation, Hartford, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05B / ; B64C / ;
U.S. Cl.
CPC ...
364424 ; 244223 ; 244227 ; 318609 ; 318628 ; 364161 ; 364190 ;
Abstract
A system which provides feel-force to the control stick of an aircraft by means of hydraulic pressure is provided with non-nulling, proportional, direct feedback loop, and a limited integral feedback loop in the drive of the pressure control servo valve that commands the pressure-generating hydraulic force actuator. Static nulls are compensated in the integral path; integration is corrected when the static null and integral output exceed a limiting value. Embodiments include software and/or hardware portions.