FEEDBACK CONTROL SYSTEM AND METHOD THAT SELECTIVELY UTILIZES OBSERVER ESTIMATES
First Claim
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1. A control system for a gas turbine engine including a plurality of actuators, the system comprising:
- an engine control law adapted to receive input commands and a plurality of feedback signals, each feedback signal representative of a sensed engine operational parameter, the engine control operable, in response to the input commands and the plurality of feedback signals, to supply engine actuator commands;
a gas turbine engine observer adapted to receive the engine actuator commands and a plurality of sensor signals, each sensor signal representative of one of the sensed engine operational parameters, the gas turbine engine observer operable, in response to the engine actuator commands and the plurality of sensor signals, to supply estimates of each of the sensed engine operational parameters; and
a feedback signal selection function adapted to receive the estimates of the sensed engine operational parameters and the plurality of sensor signals, the feedback signal selection function configured to selectively supply each of the feedback signals representative of a sensed engine operational parameter as either (i) the sensor signal representative thereof or (ii) the estimate thereof.
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Abstract
A system and method implements improved machine performance, most preferably for gas turbine engines. The system and method implement a control law that receives sensed operational parameter feedback signals. For each sensed engine operational parameter, the feedback signals that are supplied to the control law selectively comprise the sensor signal representative of the engine operational parameter, if the sensor signal is valid, or an observer estimate of the sensed engine operational parameter, if the sensor signal is invalid.
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Citations
21 Claims
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1. A control system for a gas turbine engine including a plurality of actuators, the system comprising:
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an engine control law adapted to receive input commands and a plurality of feedback signals, each feedback signal representative of a sensed engine operational parameter, the engine control operable, in response to the input commands and the plurality of feedback signals, to supply engine actuator commands; a gas turbine engine observer adapted to receive the engine actuator commands and a plurality of sensor signals, each sensor signal representative of one of the sensed engine operational parameters, the gas turbine engine observer operable, in response to the engine actuator commands and the plurality of sensor signals, to supply estimates of each of the sensed engine operational parameters; and a feedback signal selection function adapted to receive the estimates of the sensed engine operational parameters and the plurality of sensor signals, the feedback signal selection function configured to selectively supply each of the feedback signals representative of a sensed engine operational parameter as either (i) the sensor signal representative thereof or (ii) the estimate thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling a gas turbine engine having engine actuators, the method comprising the steps of:
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sensing engine operational parameters and supplying, for each sensed engine operational parameter, a sensor signal representative thereof; generating a gas turbine engine observer, the gas turbine engine observer responsive to engine actuator commands and at least some of the sensed engine operational parameters to supply estimates of each sensed engine operational parameter; supplying engine actuator commands from an engine control law to the gas turbine engine observer and to the engine actuators; determining if each of the sensor signals is invalid; and for each of the sensed engine operational parameters, supplying a feedback signal representative thereof to the engine control law, the supplied feedback signal being (i) the sensor signal representative of the engine operational parameter if the sensor signal is valid and (ii) the estimate of the sensed engine operational parameter if the sensor signal is invalid. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A gas turbine engine system, comprising:
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a gas turbine engine including a plurality of actuators and a plurality of sensors, each sensor operable to sense an engine operational parameter and supply a sensor signal representative thereof, and an engine controller coupled to the gas turbine engine adapted to receive input commands and a plurality of feedback signals, each feedback signal representative of a sensed engine operational parameter, the engine controller operable, in response to the input commands and the plurality of feedback signals, to supply at least engine actuator commands to the plurality of engine actuators, the engine controller including; an engine control law adapted to receive the input commands and the plurality of feedback signals and operable, in response thereto, to supply the engine actuator commands, a gas turbine engine observer adapted to receive the engine actuator commands and at least a portion of the sensor signals and operable, in response thereto, to supply estimates of each of the sensed engine operational parameters; and a feedback signal selection function adapted to receive the estimates of the sensed engine operational parameters and each of the sensor signals, the feedback signal selection function configured to selectively supply each of the feedback signals representative of a sensed engine operational parameter as either (i) the sensor signal representative thereof or (ii) the estimate thereof.
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21. A control system for a machine including a plurality of actuators, the system comprising:
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a control law adapted to receive input commands and a plurality of feedback signals, each feedback signal representative of a sensed machine operational parameter, the control law operable, in response to the input commands and the plurality of feedback signals, to supply machine actuator commands; a machine observer adapted to receive the machine actuator commands and a plurality sensor signals, each sensor signal representative of one of the sensed machine operational parameters, the machine observer operable, in response to the machine actuator commands and the sensor signals, to supply estimates of each of the sensed machine operational parameters; and a feedback signal selection function adapted to receive the estimates of the sensed machine operational parameters and the plurality of sensor signals, the feedback signal selection function configured to selectively supply each of the feedback signals representative of a sensed machine operational parameter as either (i) the sensor signal representative thereof or (ii) the estimate thereof.
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Specification