Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – With electrical means comparing and reducing error related...
Reexamination Certificate
2006-10-12
2009-11-03
Nguyen, Ninh H (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
With electrical means comparing and reducing error related...
C416S044000, C700S030000
Reexamination Certificate
active
07611329
ABSTRACT:
For constant-speed synchrophasing of the propellers (14) of the propulsion units (10) of an aircraft each equipped with an electronic control circuit (20) connected to a communications network (32) of the aircraft, each control circuit of a propulsion unit includes a clock delivering a clock signal at a frequency representing a rotational speed of the propulsion unit propeller corresponding to said constant speed, the control circuit clocks are kept substantially synchronous by communication via the communications network of the aircraft, and in each propulsion unit, the offset between the clock signal and a signal produced from a propeller rotational speed sensor is measured and compared to a determined propeller phase value assigned to the propulsion unit and, depending on the result of the comparison, an instantaneous variation of the propeller rotational speed is applied as necessary so as to bring the measured offset to the determined value.
REFERENCES:
patent: 3007529 (1961-11-01), Brockert et al.
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patent: 5224304 (1993-07-01), Cesna
patent: 5335175 (1994-08-01), Turner
patent: 5453943 (1995-09-01), Magliozzi
patent: 5551649 (1996-09-01), Kaptein
patent: 5789678 (1998-08-01), Pla
Hispano-Suiza
Nguyen Ninh H
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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