Method and system for controlling a pneumatic valve
AssigneePratt & Whitney Canada Corp.
InventorsAndrew Walz, Mehmet Tanju
Life of this patent
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Abstract
Methods and systems for controlling a pneumatic starter air valve of a gas turbine engine are described herein. The starter air valve is controlled in a first mode of operation by actuating a first solenoid of the starter air valve with a steady-state input signal. Passage of the steady-state input signal to a second solenoid of the starter air valve is allowed, to actuate the second solenoid and enable pressure regulation of the starter air valve. The starter air valve is controlled in a second mode of operation by actuating the first solenoid with a pulse-width modulation input signal. Passage of the pulse-width modulation input signal to the second solenoid is prevented, to disable the pressure regulation in the second mode of operation.
Claims13
A method for controlling a pneumatic starter air valve of a gas turbine engine, the method comprising:
- controlling the starter air valve in a first mode of operation by actuating a first solenoid of the starter air valve with a steady-state input signal;
- allowing passage of the steady-state input signal to a second solenoid of the starter air valve to actuate the second solenoid and enable pressure regulation of the starter air valve;
- controlling the starter air valve in a second mode of operation by actuating the first solenoid with a pulse-width modulation input signal;
- and
- preventing passage of the pulse-width modulation input signal to the second solenoid to disable the pressure regulation in the second mode of operation.
A system for controlling a pneumatic starter air valve of a gas turbine engine, the system comprising:
- a first solenoid configured to operate the starter air valve in a first mode when the first solenoid is actuated by a steady-state input signal and to operate the starter air valve in a second mode when the first solenoid is actuated by a pulse-width modulation input signal;
- a second solenoid configured to enable pressure regulation by a pressure regulator of the starter air valve when the second solenoid is actuated by the steady-state voltage input signal;
- and
- an electronic circuit between the first solenoid and the second solenoid, the electronic circuit configured to allow passage of the steady-state input signal to the second solenoid and to prevent passage of the pulse-width modulation input signal to the second solenoid, the pressure regulation being disabled when the second solenoid is prevented from being actuated.
Dependencies are inferred from the claim text.