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:
May. 27, 1980
Filed:
Jul. 10, 1978
Luc P Cyrot, Mission Viejo, CA (US);
Parker-Hannifin Corporation, Cleveland, OH (US);
Abstract
A device for controlling hydraulic motors as in an aircraft 'fly-by-wire' system wherein redundant hydraulic motors and controls are required to protect against failure of portions of the system or device. The device includes two master valves for controlling flow of fluid to and from the motors, one controlled by electrical signals from a command station and the other controlled mechanically through manual or automatic operation. There is a transfer valve for selecting which of the master valves is to be operable and to provide for smooth transition of control from the electrically controlled valve to the mechanically controlled valve. The electrically controlled valve is positioned by means of an articulated command shaft of hybrid force displacement summing structure having redundant hydraulic drive units each controlled by redundant electro-hydraulic servo valves and wherein failed servo valves are accounted for in the force displacement summing structure in a manner to avoid the need for rapid failure detection and correction.