United Technologies Corporation

Other

Frank R Niessen

Kermit I Harner

Roy W Schneider

Joseph M Kos

Robert Sherman

An automatic control system includes a multiplier for multiplying the error signal fed to an integrator in accordance with the state of the integrator. The multiplier multiplies the error signal by a unity gain factor over the normal range of integral control; whereas, the multiplier multiplies the error signal by a factor greater than one, typically ten, when the integrator output is saturated at either the minimum or maximum values. The high multiplication value of the error signal ensures a sufficiently quick recovery from an integrator saturation condition.

Automatic reset circuit for integral control

An apparatus for controlling the phase of a slave propeller relative to that of a master propeller is shown and described. A logic means having a trajectory function, F(.phi..sub.E), which defines the region for phase holding, i.e. where the error correction signal, .phi..sub.EC, equals phase error .phi..sub.E. In the region of phase holding, normal control is achieved and there is no slipping of control from a first propeller blade to a second propeller blade.

Propeller synchrophaser control with trajectory logic

An improved slave propeller SYNCHROPHASER.RTM. device and mode logic for a multi-propeller aircraft is disclosed. A designated master propeller has at least one associated slave propeller which has its speed and phase controlled with respect to the master by initially controlling the speed of the slave propeller to within a selected constant number of RPM of the master so that the master and slave propellers are periodically in phase and then switching to phase control for controlling the speed of the slave propeller in the presence of a phase difference signal having an absolute magnitude less than a selected absolute magnitude. A selected phase difference relationship between the master and the slave may thus be effected with minimum transient effect on the speed of the slave propeller.

Propeller Synchrophaser.RTM. device and mode logic

A blade pitch angle control system for a wind turbine includes an improved control means (95) for providing a minimum pitch angle reference signal indicative of desired blade pitch at wind velocities less than rated. The control means includes means (35 and 30) for providing signals indicative of generated (output) power or torque and the rotational frequency of the wind turbine rotor. The output and rotor speed signals are input to a function generator which, in response to such signals, provides a signal indicative of the minimum pitch angle.

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Stafford Springs, CT, United States of America

Frank R Niessen