公开(公告)号：GB2347974B

公开(公告)日：2003-02-26

申请号：GB0002681

申请日：2000-02-04

Applicant: UNITED TECHNOLOGIES CORP

Inventor： DANIELSON DAVID R ,  DEGEORGE CHARLES ,  CARVALHO PAUL A

IPC: B64C11/30 ,  B64C11/38 ,  B64C11/40 ,  B64C11/42 ,  B64C11/44

Abstract: An improved electronic hydraulic propeller control designed as a retro-fit kit for existing Hamilton Standard Division 54460 and 54H60 propeller controllers includes an apparatus for controlling the pitch angle of a propeller blade. The retro-fit kit includes an electro-hydraulic servo valve, an electronic controller, a protection valve, and a propeller maintenance interface panel. These components functionally replace the existing hydromechanical propeller control system without reconfiguration of the existing interface. The apparatus converts mechanical inputs of the propeller and airframe systems to electronic signals, which can be measured by the electronic control. The apparatus also receives and converts the electronic control's commands into hydraulic pressure and flow changes through an electro-hydraulic servo valve. The electronic controller performs the required calculations to interpret and then react to changes in the propeller/airframe systems. The electronic controller has two channels in a master/slave configuration to provide back up control of 90% of all functionality. Back-up systems are implemented through a protection valve, which can override hydraulic inputs from the electro-hydraulic servo valve. The propeller maintenance interface panel provides a link between the aircraft personnel and the propeller system to allow for calibration, fault interrogation, and real time data display.

公开(公告)号：GB2347974A

公开(公告)日：2000-09-20

申请号：GB0002681

申请日：2000-02-04

Applicant: UNITED TECHNOLOGIES CORP

Inventor： DANIELSON DAVID R ,  DEGEORGE CHARLES ,  CARVALHO PAUL A

IPC: B64C11/30 ,  B64C11/38 ,  B64C11/40 ,  B64C11/42 ,  B64C11/44

Abstract: An actuator 39 for controlling the angle of a plurality of propeller blades 12, is supplied with hydraulic pressure by means of a servo valve 20, controlled by an electronic controller 16. A protection valve 24, selectively provides fluid communication between the servo valve 20, and the actuator 39, in accordance with a protect pressure provided in line 5, by a back-up device which actuates the valve in response to a predetermined condition. The condition may include testing, manual override, or a malfunction of the electronic control. Back-up devices may include a feather solenoid 26, a negative torque system 32, and a mechanical feather valve 34. A disarm valve 52, may be provided in series with a negative torque valve 50, the disarm valve being actuated by a cam 54, interconnected with a pilot operated lever 58, by means of a rod 60.