Compact aero-thermo model based control system estimator starting algorithm

A method for controlling a control device, the method comprising:

• generating a model output using a model processor, the model processor comprising:
• an input object for processing a model input vector and setting a model operating mode, the model operating mode being a starting mode if the model input vector comprises a data range associated with a starting operation of the control device;
• a set state module for setting dynamic states of the model processor, the dynamic states input to an open loop model based on the model operating mode;
• wherein the open loop model generates current state derivatives, solver state errors, and synthesized parameters as a function of the dynamic states and the model input vector, wherein a constraint on the current state derivatives and solver state errors is based on a series of cycle synthesis modules, each member of the series of cycle synthesis modules modeling a component of a cycle of the control device and comprising a series of utilities, the utilities based on mathematical abstractions of physical laws that govern behavior of the component;
• an estimate state module for determining an estimated state of the model based on at least one of a prior state, the current state derivatives, the solver state errors, and the synthesized parameter;
• and
• an output object for processing at least the synthesized parameters of the model to determine the model output;
• directing an actuator associated with the control device as a function of a model output using a control law;
• and
• positioning a control surface of the control device using the actuator.

A gas turbine engine comprising:

• a fan;
• a compressor section downstream of the fan;
• a combustor section downstream of the compressor section;
• an actuator for positioning a control surface of an element of the gas turbine engine;
• a control law for directing the actuator as a function of a model output;
• a model processor for generating the model output, the model processor comprising:
• an input object for processing a model input vector and setting a model operating mode, the model operating mode being a starting mode if the model input vector comprises a data range associated with a starting operation of the gas turbine engine;
• a set state module for setting dynamic states of the model processor, the dynamic states input to an open loop model based on the model operating mode;
• wherein the open loop model generates current state derivatives, solver state errors, and synthesized parameters as a function of the dynamic states and the model input vector, wherein a constraint on the current state derivatives and solver state errors is based on a series of cycle synthesis modules, each member of the series of cycle synthesis modules modeling a component of a cycle of the gas turbine engine and comprising a series of utilities, the utilities based on mathematical abstractions of physical laws that govern behavior of the component;
• an estimate state module for determining an estimated state of the model based on at least one of a prior state, the current state derivatives, the solver state errors, and the synthesized parameters;
• and
• an output object for processing at least the synthesized parameters of the model to determine the model output.