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:
Mar. 03, 1998
Filed:
Jul. 25, 1994
Steven W Lampe, Poway, CA (US);
Alan Greubel, San Diego, CA (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
A hydraulic start system is provided having separate, sequentially started hydraulic motors for the controller PMG and for the gas turbine engine starter. Fluid pressure is provided by a hydraulic accumulator to both motors through separating valves. The PMG motor is supplied with fluid first and that drives the PMG to power up and initialize the controller before the starter motor is utilized. The engine itself is coupled to both the starter motor and the PMG through overrunning clutches such that starting the PMG does not start the engine. Once the controller is initialized, fluid is provided to the starter motor and the engine is accelerated through the light-off window and up to a self sustaining speed. As the engine accelerates, it couples with and drives the PMG, decoupling the PMG from its hydraulic motor and shutting off the fluid flow to that motor. Since the controller is fully initialized as the engine reaches the light-off window, effective ignition can occur and stable combustion is available thereafter.