Rolls-Royce Corporation

David Michael Gainford

Jonathan E Holt

Stephen Granville Garner

Jonathan Edmund Holt

A method of controlling blade pitch angle, including comparing demanded and measured blade pitch angle and calculating any difference therebetween, in a primary electrical control system, where there is a difference, applying torque to a blade pitch regulator to reduce the magnitude of the difference to zero, and in a secondary electrical control system, where the difference is greater than a pre-determined threshold, applying torque to a blade pitch regulator to reduce the magnitude of the difference to the threshold. Also an electrical system of blade pitch angle control for a set of blades including primary and secondary electrical control systems, means for comparing demanded and measured blade pitch angle and calculating any difference therebetween, a look-up function having the difference as its input and outputting a required torque, and a torque regulator to apply the required torque to the set of blades.

Blade pitch control

An engine having at least one stage of propeller rotor blades, and a load, the at least one stage being associated with electrical generation means to generate electricity for the load. The load is switchable into a high load state in the event of an overspeed signal from the rotor blades. Also a method of controlling rotor overspeed of an engine, characterized by the steps of:

Controlling propeller rotor overspeed

A fuel metering unitfor an aircraft. The unithaving an inlet legwithin which fuel flows, which legsplits into controlling legswhich rejoin downstream to form an outlet legShut off valvesare provided respectively in the controlling legand outlet legFuel flow through the legsis compared, and if an unexpected relative comparison is made, fuel flow through one or both of the legscan be stopped using respectively either of the valves

Fuel metering unit

A pump control system () for a pump () in a gas turbine engine () is described. The pump control system () comprises demand means () for providing a demand signal () relating to a required rate of fluid flow and/or pressure from the pump (). The system also comprises sensing means () to sense at least one parameter of fluid downstream of the pump () and to provide at least one feedback signal () relating to the, or each, respective parameter. Comparator means () is provided for comparing the demand signal () with the, or at least one, feedback signal to provide a control signal () for controlling the pump.

Growing community of inventors

Birmingham, United Kingdom

David Michael Gainford