Fault detector for a triplexed mechanical or hydromechanical sys

Details Fault detector for a triplexed mechanical or hydromechanical sys Fault detector for a triplexed mechanical or hydromechanical sys

1985-10-21

1987-08-25

Garrett, Robert E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Fluid operated

91390, 91509, 244226, F15B 1316, F15B 1100

Patent

active

046884696

ABSTRACT:
A fault detector for a triplexed mechanical or hydromechanical system which provides for improvement in cost, reliability and weight over previously known balance beam arrangements for achieving redundant two-channel operation to provide a fail-operating first failure mode for operation of aircraft components which require reliable operation for flight safety. The fault detector for a triplexed mechanical or hydromechanical system has a tripodal summing member which receives three mechanical position signals in three different channels with the tripodal summing member retaining a position perpendicular to the force transmitted by the tripodal summing member in response to the position signals and tipping when one of the input signals deviates significantly from the other two. A structure for detecting a malfunction senses a greater amount of movement of the tripodal summing member at its connection to the mechanical position signal which is malfunctioning to provide an indication as to which mechanical position signal is faulty. In response to detection of the faulty operation, a mechanism disconnects the channel having the faulty operation. An alignment structure is operable to restore the tripodal summing member to its normal perpendicular position to enable continued operation by means of the mechanical position signals which are still accurate.

REFERENCES:
patent: 2856788 (1958-10-01), Jovanovich
patent: 3051137 (1962-08-01), Kutzler
patent: 3269676 (1966-08-01), Hopkins
patent: 3411410 (1968-11-01), Westbury et al.
patent: 3438306 (1969-04-01), Kazmarek
patent: 3464319 (1969-09-01), Sherman et al.
patent: 3527143 (1970-09-01), Hayter
patent: 3762237 (1973-10-01), Stevko
patent: 4403756 (1983-09-01), Berlin et al.

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