LINEAR QUADRATIC REGULATOR CONTROL FOR BLEED AIR SYSTEM FAN AIR VALVE
First Claim
1. A system for controlling gas turbine engine bleed air temperature, comprising:
- a fan air valve adapted to receive a flow of fan air from a turbofan gas turbine engine intake fan, the fan air valve coupled to receive valve position commands and configured, in response to the valve position commands, to move to a valve position to thereby control the engine bleed air temperature; and
a fan air valve controller configured to implement a linear quadratic regulator (LQR) control, the fan air valve controller adapted to receive a plurality of sensor signals, each sensor signal representative of one or more system parameters, the controller configured, in response to the sensor signals, to supply the valve position commands to the fan air valve.
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Accused Products
Abstract
A system and method are provided for controlling the temperature of engine bleed air from a turbofan gas turbine engine. The system includes a fan air valve and a fan air valve controller. The fan air valve is adapted to receive a flow of fan air from a turbofan gas turbine engine intake fan. The fan air valve is coupled to receive valve position commands and is configured, in response to the valve position commands, to move to a valve position to thereby control the engine bleed air temperature. The fan air valve controller is configured to implement a linear quadratic regulator (LQR) control. The fan air valve controller is adapted to receive a plurality of sensor signals, each sensor signal representative of one or more system parameters, and is configured, in response to the sensor signals, to supply the valve position commands to the fan air valve.
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Citations
17 Claims
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1. A system for controlling gas turbine engine bleed air temperature, comprising:
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a fan air valve adapted to receive a flow of fan air from a turbofan gas turbine engine intake fan, the fan air valve coupled to receive valve position commands and configured, in response to the valve position commands, to move to a valve position to thereby control the engine bleed air temperature; and a fan air valve controller configured to implement a linear quadratic regulator (LQR) control, the fan air valve controller adapted to receive a plurality of sensor signals, each sensor signal representative of one or more system parameters, the controller configured, in response to the sensor signals, to supply the valve position commands to the fan air valve. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A turbofan gas turbine engine bleed air temperature control system, comprising:
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a heat exchanger having a bleed air inlet, a bleed air outlet, a cooling air inlet, and a cooling air outlet, the bleed air inlet adapted to receive a flow of bleed air from a turbofan gas turbine engine, the cooling air inlet adapted to receive a flow of cooling air from a turbofan gas turbine engine intake fan, the heat exchanger configured to facilitate heat transfer from the bleed air to the cooling air and thereby discharge relatively cooler bleed air from the bleed air outlet, and relatively warmer cooling air from the cooling air outlet; a bleed air temperature sensor disposed downstream of the bleed air outlet, the bleed air temperature sensor configured to sense the temperature of the bleed air discharged from the bleed air outlet and supply a bleed air temperature signal representative thereof; a fan air temperature sensor disposed downstream of the fan air outlet, the fain air temperature sensor configured to sense the temperature of the fan air discharged from the fan air outlet and supply a fan air temperature signal representative thereof; a fan air valve disposed upstream of the cooling air inlet, the fan air valve coupled to receive valve position commands and configured, in response to the valve position commands, to move to a valve position and thereby control the flow of cooling air into the cooling air inlet; and a fan air valve controller configured to implement a linear quadratic regulator (LQR) control, the fan air valve controller adapted to receive at least the bleed air temperature signal, the fan air temperature signal, and a signal representative of fan air flow through the heat exchanger, and configured, in response to at least these signals, to supply the valve position commands to the fan air valve. - View Dependent Claims (9, 10, 11, 12)
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13. A method of controlling bleed air temperature from a turbofan gas turbine engine, the method comprising the steps of:
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flowing engine bleed air through a heat exchanger; flowing fan air through a fan air valve and the heat exchanger to thereby cool the engine bleed air and supply cooled engine bleed air, the fan air valve disposed upstream of the heat exchanger; determining cooled engine bleed air temperature; determining fan air temperature; determining fan air flow through the heat exchanger; supplying the determined fan air flow, fan air temperature, and cooled engine bleed air temperature to a controller that implements linear quadratic regulator (LQR) control; and using linear quadratic regulator (LQR) control to control fan air valve position, to thereby control fan air flow into the heat exchanger and cooled engine bleed air temperature. - View Dependent Claims (14, 15, 16, 17)
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Specification