Piston servo-actuation main system with hydromechanically self-contained detection
AssigneeIndustria de Turbo Propulsores, S.A.
InventorJosé Javier Alvarez Garcia
Life of this patent
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Abstract
Main piston servo-actuation system, with hydromechanic self-contained failure detection device, working with hydraulic fluid supplied by a pump, including two servovalves (1 and 2) which are identical in design, controlling a piston (3) mechanically linked to a position transducer (4) according to the electrical demand (6, 7) supplied by the feedback position control loops (8 and 9) for the servovalves (1 and 2) to the torque motors (12 and 13) of the servovalves. These loops (8 and 9) receive the same piston position request, and they are given feedback at the same time with the same position signal fed by the position transducer (4). The system is furthermore compensated by two pressure selection valves (14 and 15) and by its own interconnection servo lines.
Claims6
A piston main servo-actuation system comprising:
- a piston;
- a position transducer mechanically connected to the piston for producing a piston position signal;
- two feedback position control loops each receiving as input the piston position signal and piston position demands and producing an electrical demand output signal;
- two servovalves, identical in design and having a torque motor, the servovavles positioning the piston in response to the electrical demand output signal received from the respective control loops, the servovavles being fed by a high pressure supply line and a low pressure return line, each servovalve having an output control line connected to opposite sides of the piston and creating a hydraulic bridge configuration formed by (i) the high pressure supply line, the low pressure return line and the control line of one servovalve controlled by a first set of restrictions, and (ii) the high pressure supply line, the low pressure return line and the control line of the other servovalve controlled by a second set of restrictions;
- and
- two pressure select valves each being balanced at one end by a spring load and pressure from a reference line and at an opposite end by a working line, the pressure select valves being set with pressure from the supply line and return line through a third set of restrictions.
Dependencies are inferred from the claim text.