Activation sensing
AssigneeROLLS-ROYCE plc
InventorsJonathan Edmund Holt, Richard Leonard Martin
Life of this patent
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Abstract
A determination of bleed valve activation in a gas turbine engine can be difficult unless the engine is maintained at a steady idle state for comparison between that state and effects of activation of the bleed valve. Furthermore, specific test activation of bleed valves increases wear and tear on those valves. By sensing a flow pressure response signal and then through appropriate averaging and processing through a non-linear filter, it is possible to identify bleed valve activation by a target signal response exceeding a threshold indicative of such bleed valve activation.
Claims23
An activation sensor arrangement for a bleed valve, the arrangement comprising a sensor for flow pressure and a non linear signal filter to accentuate a response signal from the sensor, and to deemphasize noise to provide a trigger signal and a monitor to receive the trigger signal for comparison with a threshold and provide an activation indicator if the trigger signal exceeds the threshold.
A method of determining bleed valve activation the method comprising:
- determining a flow pressure value as a response signal;
- applying a non linear signal filter to the response signal wherein the non linear signal filter acts to accentuate the response signal and to deemphasize noise in order to provide a trigger signal;
- and,
- comparing the trigger signal with a threshold and providing an activation indicator if the trigger signal exceeds the threshold.
Dependencies are inferred from the claim text.