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US 2008/0177456 A1Published application
Engine control system
AssigneeROLLS-ROYCE plc
InventorsDAVID CHARLES HILL, Ian Allan Griffin
Life of this patent
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AssigneeROLLS-ROYCE plc
InventorsDAVID CHARLES HILL, Ian Allan Griffin
Estimating the term…
Engine control systems utilize a number of potential control loop regimes optimized for particular engine conditions. These loops may relate to transient conditions or engine steady state. The choice of engine control loop is made by a selector by the error divergence between measured signals and reference signals. These reference signals generate adjustment demands for the engine. It is possible for the nature of the selector to select the steady state control loop prior to acquisition of the desired target performance criteria. The steady state control loop will take longer to achieve the optimum performance conditions. The present invention provides for a multiplier, such as squaring of the error divergence, in order to retain authority for the transient control loop control beyond the normal selector determined error divergence criteria.
An engine control system for controlling a gas turbine engine, the system comprising a controller and means to determine engine performance or desired engine performance, the controller including a plurality of control loops, each control loop arranged to provide a control signal for engine control dependent upon objective criteria and the controller including a selector for determination of the control loop for actual engine control dependent upon current or desired engine performance determined by the means to determine at least one of engine performance and desired engine performance, the selector utilizing error divergence between the respective control signals provided by the respective control loops and a representative signal for current or desired engine performance and the error divergence for the control loop determined by the selector subject to a multiplier to sustain use of the control loop until approaching parity between the control signal of the control loop selected by the selector and the representative signal for current or desired engine performance.
A gas turbine engine comprising:
Dependencies are inferred from the claim text.