METHOD AND SYSTEM FOR CONTROLLING A CROSSING THRESHOLD USED IN DETERMINING ROTATIONAL SPEED OF A PROPELLER

A method for controlling a crossing threshold used in determining a rotational speed of a propeller of an aircraft engine. An initial value for the crossing threshold (130) is set. A sensor signal (122) is received that comprises a first series of pulses (135A, 135B, 135C) indicative of passage of p...

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Bibliographische Detailangaben
Hauptverfasser:	FARRELL, Ian, YAKOBOV, Ella
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT MEASURING MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR PHYSICS TARIFF METERING APPARATUS TESTING
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Beschreibung
Zusammenfassung:	A method for controlling a crossing threshold used in determining a rotational speed of a propeller of an aircraft engine. An initial value for the crossing threshold (130) is set. A sensor signal (122) is received that comprises a first series of pulses (135A, 135B, 135C) indicative of passage of position markers about a circumference of a propeller shaft. A detection signal (150) is generated that comprises a second series of pulses (155A, 155B, 155C) indicative of within the first series of pulses (13A, 135B, 135C) that have a zero-crossing transition (140A, 140B, 140C) and a magnitude that exceeds the crossing threshold (130). The rotational speed of the propeller is determined from the detection signal (150). The crossing threshold (130) is adjusted as a function of the rotational speed.