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:
Dec. 05, 2017
Filed:
Dec. 11, 2012
Windflow Technology Limited, Christchurch, NZ;
Geoffrey Morgan Henderson, Christchurch, NZ;
Peter John Scott, Christchurch, NZ;
Matthew James Silvester, Christchurch, NZ;
Richard James Trudgian, Christchurch, NZ;
WINDFLOW TECHNOLOGY LIMITED, Christchurch, NZ;
Abstract
A hydraulic control system HCS for controlling a variable ratio transmission of a power generating system. A hydraulic motor/pump unitis operably connected to a superposition gear, and is connected to a hydraulic circuit that comprises an orificeand/or a relief valvethat opens at a predetermined hydraulic pressure. The hydraulic circuit switches between a variable low-speed operating mode and a torque limiting high-speed operating mode. In the torque limiting high-speed operating mode the hydraulic motor/pump unitis driven by the superposition gear and drives hydraulic fluid through the orificeand/or relief valveto provide a passive torque limiting function. In the variable low-speed operating mode the hydraulic motor/pump unitdrives the superposition gear and the hydraulic control system provides a desired rotorspeed by controlling hydraulic fluid flow rate through the hydraulic motor/pump unit