Device and method for protecting an aircraft turbomachine computer against speed measurement errors

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United States of America Patent

PATENT NO 9759085
SERIAL NO

14441668

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Importance

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Abstract

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A device protecting an aircraft turbomachine computer against speed measurement errors, including: on a speed regulation channel: a speed sensor of a turbomachine gearbox shaft, a speed measurement circuit, and a speed regulation circuit; on a monitoring channel: a speed sensor of a turbomachine gas generator shaft, a speed measurement circuit, and a turbomachine stop control circuit. Each channel uses dissimilar characteristics eliminating common mode errors. Each speed sensor delivers a pseudo-sine frequency signal. On each channel, speed monitoring circuits compare the frequency signal with a minimum threshold, delivering an error signal when the measured frequency is lower than the minimum threshold. A common speed cross checking circuit detects exceeding a determined deviation between both frequencies, the monitored deviation being higher or lower than a maximum deviation corresponding to loss of a frequency period on either sensor. Analyzing the error signals, exceeding the determined deviation can control stopping the turbomachine.

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Patent Owner(s)

Patent OwnerAddress
SAFRAN POWER UNITSTOULOUSE

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Joachim, Remi Dremil-Lafage, FR 3 5
Pasquier, Ludovic Bruguieres, FR 2 4

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