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. 01, 2020
Filed:
Dec. 21, 2018
Honeywell International Inc., Morris Plains, NJ (US);
Paul W. Futa, Jr., North Liberty, IN (US);
Sammuel Tillich, South Bend, IN (US);
Steven Alan Lewis, South Bend, IN (US);
Christopher Douglas Eick, Phoenix, AZ (US);
Donald Striker, Chandler, AZ (US);
Michael Albert McPherson, Phoenix, AZ (US);
HONEYWELL INTERNATIONAL INC., Charlotte, NC (US);
Abstract
A propeller pitch control system for a turboprop engine of an aircraft includes an engine control unit and a pitch control unit. The engine control unit is operable to determine a phase of flight of the aircraft and is configured to supply control commands. The pitch control unit is coupled to receive the control commands from the engine control unit and includes a housing, a beta piston, a position sensor, a beta tube, and an electrohydraulic valve. The engine control unit only commands the electrohydraulic valve to move the beta piston from the fully retracted position when the engine control unit determines the aircraft is conducting pre-takeoff roll taxiing operations or is conducting post landing touchdown operations.